[manager] There was no way to specify transport domain.

The transport domains was assumed to be IPv4 (transportDomainUdpIpv4).
This has now been changed so that it can also be IPv6
(transportDomainUdpIpv6).
To facilitate this, the transport domain, tdomain,
is now a (new) valid option when registering (snmpm#register_agent)
a new agent (and updating (snmpm#update_agent_info) agent info).
This also mean that the transport behaviour has changed.
OTP-9305

Merge branch 'bmk/snmp/manager/transport_domain/OTP-9305' into bmk/snmp/snmp421_integration

18 files changed, 808 insertions, 296 deletions

diff --git a/lib/snmp/Makefile b/lib/snmp/Makefile
index 20e3d4692a..c55eff04c6 100644
--- a/lib/snmp/Makefile
+++ b/lib/snmp/Makefile
@@ -67,7 +67,7 @@ do_configure: configure
 configure: configure.in
 	autoconf
 
-.PHONY: info
+.PHONY: info gclean
 
 info: 
 	@echo "OS:       $(OS)"
@@ -76,6 +76,9 @@ info:
 	@echo "SNMP_VSN: $(SNMP_VSN)"
 	@echo "APP_VSN:  $(APP_VSN)"
 
+gclean: 
+	git clean -fXd
+
 
 # ----------------------------------------------------
 # Application (source) release targets
diff --git a/lib/snmp/doc/src/Makefile b/lib/snmp/doc/src/Makefile
index 35ed63e103..1bbd1bfafc 100644
--- a/lib/snmp/doc/src/Makefile
+++ b/lib/snmp/doc/src/Makefile
@@ -152,6 +152,7 @@ $(TOP_PDF_FILE): $(XML_FILES)
 pdf: $(TOP_PDF_FILE)
 
 html: gifs $(HTML_REF_MAN_FILE)
+html2: html $(INDEX_TARGET)
 
 clean clean_docs: clean_html clean_man clean_pdf
 	rm -f errs core *~
@@ -228,6 +229,7 @@ clean_man:
 clean_html:
 	@echo "cleaning html:"
 	rm -rf $(HTMLDIR)/*
+	rm -f $(INDEX_TARGET)
 
 $(MAN7DIR)/%.7: $(MIBSDIR)/%.mib
 	@echo "processing $*"
diff --git a/lib/snmp/doc/src/notes.xml b/lib/snmp/doc/src/notes.xml
index cf9d2b3834..7e4099c7a8 100644
--- a/lib/snmp/doc/src/notes.xml
+++ b/lib/snmp/doc/src/notes.xml
@@ -33,6 +33,60 @@
   </header>
 
   <section>
+    <title>SNMP Development Toolkit 4.21</title>
+    <p>Version 4.21 supports code replacement in runtime from/to
+      version 4.20.1, 4.20, 4.19 and 4.18.</p>
+
+    <section>
+      <title>Improvements and new features</title>
+<!--
+      <p>-</p>
+-->
+      <list type="bulleted">
+        <item>
+          <p>[manager] There was no way to specify transport domain. 
+	  The transport domains was assumed to be IPv4 (transportDomainUdpIpv4).
+	  This has now been changed so that it can also be IPv6 
+	  (transportDomainUdpIpv6). 
+	  To facilitate this, the transport domain, <c>tdomain</c>, 
+	  is now a (new) valid option when 
+	  <seealso marker="snmpm#register_agent">registering</seealso>
+	  a new agent (and 
+	  <seealso marker="snmpm#update_agent_info">updating</seealso> 
+	  agent info). </p>
+	  <p>This also mean that the transport behaviour has changed. </p>
+          <p>Own Id: OTP-9305</p>
+          <p>Aux Id: Seq 11847</p>
+        </item>
+      </list>
+    </section>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+      <p>-</p> 
+
+<!--
+      <list type="bulleted">
+        <item>
+          <p>[agent] Did not handle transport domains properly in some 
+	  cases. </p>
+          <p>Own Id: OTP-9400</p>
+        </item>
+
+      </list>
+-->
+    </section>
+
+
+    <section>
+      <title>Incompatibilities</title>
+      <p>-</p>
+    </section>
+
+  </section> <!-- 4.21 -->
+
+
+  <section>
     <title>SNMP Development Toolkit 4.20.1</title>
     <p>Version 4.20.1 supports code replacement in runtime from/to
       version 4.20, 4.19 and 4.18.</p>
@@ -56,7 +110,6 @@
 <!--
       <p>-</p> 
 -->
-
       <list type="bulleted">
         <item>
           <p>[agent] Did not handle transport domains properly in some cases, 
diff --git a/lib/snmp/doc/src/snmpm.xml b/lib/snmp/doc/src/snmpm.xml
index b527d171b0..c36a1b2a24 100644
--- a/lib/snmp/doc/src/snmpm.xml
+++ b/lib/snmp/doc/src/snmpm.xml
@@ -283,27 +283,27 @@ sec_level = noAuthNoPriv | authNoPriv | authPriv
         <v>TargetName = target_name()</v>
         <v>Config = [agent_config()]</v>
         <v>agent_config() = {Item, Val}</v>
-        <v>Item = engine_id | address | port | community | timeout | max_message_size | version | sec_model | sec_name | sec_level</v>
+        <v>Item = engine_id | address | port | community | timeout | max_message_size | version | sec_model | sec_name | sec_level | tdomain</v>
         <v>Val = term()</v>
         <v>Reason = term()</v>
       </type>
       <desc>
         <p>Explicitly instruct the manager to handle this agent, with
-          <c>UserId</c> as the responsible user. </p>
-        <p>Called to instruct the manager that this agent 
-          shall be handled. This function is used when
-          the user knows in advance which agents the
-          manager shall handle.
-          Note that there is an alternate way to do the same thing:
-          Add the agent to the manager config files (see 
-          <seealso marker="snmp_manager_config_files#agents">agents.conf</seealso>).</p>
+	<c>UserId</c> as the responsible user. </p>
+        <p>Called to instruct the manager that this agent shall be handled. 
+	This function is used when the user knows in advance which agents 
+	the manager shall handle.
+	Note that there is an alternate way to do the same thing:
+	Add the agent to the manager config files (see 
+	<seealso marker="snmp_manager_config_files#agents">agents.conf</seealso>).</p>
         <p><c>TargetName</c> is a non-empty string, 
-          uniquely identifying the agent. </p>
-        <p>The type of <c>Val</c> depends on <c>Item</c>: </p>
+	uniquely identifying the agent. </p>
+	<p>The type of <c>Val</c> depends on <c>Item</c>: </p>
 <code type="none"><![CDATA[
 [mandatory] engine_id = string()
 [mandatory] address = ip_address()
 [optional]  port = integer()
+[optional]  tdomain = transportDomainUdpIpv4 | transportDomainUdpIpv6
 [optional]  community = string()
 [optional]  timeout = integer() | snmp_timer()
 [optional]  max_message_size = integer()
@@ -312,7 +312,9 @@ sec_level = noAuthNoPriv | authNoPriv | authPriv
 [optional]  sec_name = string() 
 [optional]  sec_level = noAuthNoPriv | authNoPriv | authPriv
 ]]></code>
-        <p>Note that if no <c>Port</c> is given, the default value is used.</p>
+        <p>Note that if no <c>tdomain</c> is given, the default value,
+	<c>transportDomainUdpIpv4</c>, is used.</p>
+        <p>Note that if no <c>port</c> is given, the default value is used.</p>
 
         <marker id="unregister_agent"></marker>
       </desc>
@@ -348,17 +350,25 @@ sec_level = noAuthNoPriv | authNoPriv | authPriv
     </func>
 
     <func>
+      <name>update_agent_info(UserId, TargetName, Info) -> ok | {error, Reason}</name>
       <name>update_agent_info(UserId, TargetName, Item, Val) -> ok | {error, Reason}</name>
       <fsummary>Update agent config</fsummary>
       <type>
         <v>UserId = term()</v>
         <v>TargetName = target_name()</v>
-        <v>Item = atom()</v>
-        <v>Val = term()</v>
+        <v>Info = [{item(), item_value()}]</v>
+        <v>Item = item()</v>
+        <v>item() = atom()</v>
+        <v>Val = item_value()</v>
+        <v>item_value() = term()</v>
         <v>Reason = term()</v>
       </type>
       <desc>
-        <p>Update agent config.</p>
+        <p>Update agent config. The function <c>update_agent_info/3</c> 
+	should be used when several values needs to be updated atomically. </p>
+	<p>See function 
+	<seealso marker="#register_agent">register_agent</seealso>) 
+	for more info about what kind of items are allowed. </p>
 
         <marker id="which_agents"></marker>
       </desc>
diff --git a/lib/snmp/src/agent/snmpa_agent.erl b/lib/snmp/src/agent/snmpa_agent.erl
index 82a7ec647b..6322f0f21d 100644
--- a/lib/snmp/src/agent/snmpa_agent.erl
+++ b/lib/snmp/src/agent/snmpa_agent.erl
@@ -1626,7 +1626,7 @@ invalidate_ca_cache() ->
 				    MasterAgent ! invalidate_ca_cache;
 				false ->
 				    %% This is running on a sub-agent node, 
-				    %% so sent skip it
+				    %% so skip it
 				    ok
 			    end;
 			_ -> % Not on this node 
diff --git a/lib/snmp/src/agent/snmpa_conf.erl b/lib/snmp/src/agent/snmpa_conf.erl
index 4b88eb69f7..c17a6abbd7 100644
--- a/lib/snmp/src/agent/snmpa_conf.erl
+++ b/lib/snmp/src/agent/snmpa_conf.erl
@@ -424,7 +424,8 @@ target_addr_entry(Name,
 		  EngineId,
 		  TMask) ->
     target_addr_entry(Name, Ip, 162, TagList, 
-		      ParamsName, EngineId, TMask, 2048).
+		      ParamsName, EngineId, 
+		      TMask, 2048).
 
 target_addr_entry(Name, 
 		  Ip, 
@@ -435,7 +436,8 @@ target_addr_entry(Name,
 		  TMask, 
 		  MaxMessageSize) ->
     target_addr_entry(Name, Ip, Udp, 1500, 3, TagList, 
-		      ParamsName, EngineId, TMask, MaxMessageSize).
+		      ParamsName, EngineId, 
+		      TMask, MaxMessageSize).
 
 target_addr_entry(Name, 
 		  Ip, 
@@ -448,7 +450,8 @@ target_addr_entry(Name,
 		  TMask, 
 		  MaxMessageSize) ->
     target_addr_entry(Name, snmp_target_mib:default_domain(), Ip, Udp, 
-		      Timeout, RetryCount, TagList, ParamsName, 
+		      Timeout, RetryCount, TagList, 
+		      ParamsName, EngineId, 
 		      TMask, MaxMessageSize).
 
 target_addr_entry(Name, 
diff --git a/lib/snmp/src/agent/snmpa_mpd.erl b/lib/snmp/src/agent/snmpa_mpd.erl
index d71786b4a7..4f50b1a674 100644
--- a/lib/snmp/src/agent/snmpa_mpd.erl
+++ b/lib/snmp/src/agent/snmpa_mpd.erl
@@ -990,7 +990,7 @@ generate_discovery_msg(NoteStore, {TDomain, TAddress},
 		       ContextName, Timeout) ->
 
     {ok, {_Domain, Address}} = transform_taddr(TDomain, TAddress),
-    
+
     %% 7.1.7
     ?vdebug("generate_discovery_msg -> 7.1.7 (~w)", [ManagerEngineID]),
     MsgID     = generate_msg_id(),
@@ -1080,8 +1080,13 @@ transform_taddr(?transportDomainUdpIpv6,
     {ok, {Domain, Address}};
 transform_taddr(?transportDomainUdpIpv6, BadAddr) ->
     {error, {bad_transportDomainUdpIpv6_address, BadAddr}};
-transform_taddr(BadTDomain, BadTAddress) ->
-    {error, {bad_domain, BadTDomain, BadTAddress}}.
+transform_taddr(BadTDomain, TAddress) ->
+    case lists:member(BadTDomain, snmp_conf:all_tdomains()) of
+	true ->
+	    {error, {unsupported_tdomain, BadTDomain, TAddress}};
+	false ->
+	    {error, {unknown_tdomain, BadTDomain, TAddress}}
+    end.
 
 
 process_taddrs(Dests) ->
@@ -1093,7 +1098,7 @@ process_taddrs([], Acc) ->
     ?vtrace("process_taddrs -> entry when done with"
 	    "~n   Acc: ~p", [Acc]),
     lists:reverse(Acc);
-
+    
 %% v3
 process_taddrs([{{TDomain, TAddress}, SecData} | T], Acc) ->
     ?vtrace("process_taddrs -> entry when v3 with"
@@ -1130,7 +1135,7 @@ process_taddrs([{TDomain, TAddress} | T], Acc) ->
 	    process_taddrs(T, Acc)
     end;
 process_taddrs(Crap, Acc) ->
-    throw({error, {taddrs_crap, Crap, Acc}}).
+    throw({error, {bad_taddrs, Crap, Acc}}).
 
 
 mk_v1_v2_packet_list(To, Packet, Len, Pdu) ->
diff --git a/lib/snmp/src/app/snmp.appup.src b/lib/snmp/src/app/snmp.appup.src
index 9d10db67a1..3c82ad56ef 100644
--- a/lib/snmp/src/app/snmp.appup.src
+++ b/lib/snmp/src/app/snmp.appup.src
@@ -22,10 +22,17 @@
 %% ----- U p g r a d e -------------------------------------------------------
 
  [
+  {"4.20.1", 
+   [
+    {load_module, snmpa_mpd, soft_purge, soft_purge, []}, 
+    {update, snmpa_agent, soft, soft_purge, soft_purge, [snmpa_mpd]}
+   ]
+  }, 
   {"4.20", 
    [
     {load_module, snmp_target_mib, soft_purge, soft_purge, []}, 
-    {load_module, snmpa_mpd, soft_purge, soft_purge, []}
+    {load_module, snmpa_mpd, soft_purge, soft_purge, []}, 
+    {update, snmpa_agent, soft, soft_purge, soft_purge, [snmpa_mpd]}
    ]
   }, 
   {"4.19", 
@@ -115,10 +122,17 @@
 %% ------D o w n g r a d e ---------------------------------------------------
 
  [
+  {"4.20.1", 
+   [
+    {load_module, snmpa_mpd, soft_purge, soft_purge, []}, 
+    {update, snmpa_agent, soft, soft_purge, soft_purge, [snmpa_mpd]}
+   ]
+  }, 
   {"4.20", 
    [
     {load_module, snmp_target_mib, soft_purge, soft_purge, []}, 
-    {load_module, snmpa_mpd, soft_purge, soft_purge, []}
+    {load_module, snmpa_mpd, soft_purge, soft_purge, []}, 
+    {update, snmpa_agent, soft, soft_purge, soft_purge, [snmpa_mpd]}
    ]
   }, 
   {"4.19", 
diff --git a/lib/snmp/src/compile/Makefile b/lib/snmp/src/compile/Makefile
index 0ceaf276a6..477002e59f 100644
--- a/lib/snmp/src/compile/Makefile
+++ b/lib/snmp/src/compile/Makefile
@@ -49,7 +49,9 @@ ESCRIPT_BIN = $(ESCRIPT_SRC:%.src=$(BIN)/%)
 
 ERL_FILES = $(MODULES:%=%.erl)
 
-TARGET_FILES = $(MODULES:%=$(EBIN)/%.$(EMULATOR)) $(ESCRIPT_BIN)
+EBIN_FILES = $(MODULES:%=$(EBIN)/%.$(EMULATOR))
+
+TARGET_FILES = $(EBIN_FILES) $(ESCRIPT_BIN)
 
 GENERATED_PARSER = $(PARSER_MODULE:%=%.erl)
 
@@ -125,7 +127,7 @@ release_spec: opt
 	$(INSTALL_DIR) $(RELSYSDIR)/src/compiler
 	$(INSTALL_DATA) $(ESCRIPT_SRC) $(PARSER_SRC) $(ERL_FILES) $(INTERNAL_HRL_FILES) $(RELSYSDIR)/src/compiler
 	$(INSTALL_DIR) $(RELSYSDIR)/ebin
-	$(INSTALL_DATA) $(TARGET_FILES) $(RELSYSDIR)/ebin
+	$(INSTALL_DATA) $(EBIN_FILES) $(RELSYSDIR)/ebin
 	$(INSTALL_DIR) $(RELSYSDIR)/bin
 	$(INSTALL_SCRIPT) $(ESCRIPT_BIN) $(RELSYSDIR)/bin
 
diff --git a/lib/snmp/src/manager/snmpm.erl b/lib/snmp/src/manager/snmpm.erl
index 0d084332de..6d2ac8d747 100644
--- a/lib/snmp/src/manager/snmpm.erl
+++ b/lib/snmp/src/manager/snmpm.erl
@@ -50,7 +50,7 @@
 	 register_agent/2, register_agent/3, register_agent/4, 
 	 unregister_agent/2, unregister_agent/3,
 	 which_agents/0, which_agents/1, 
-	 agent_info/2, update_agent_info/4, 
+	 agent_info/2, update_agent_info/3, update_agent_info/4, 
 	 
 	 register_usm_user/3, unregister_usm_user/2, 
 	 which_usm_users/0, which_usm_users/1, 
@@ -167,6 +167,7 @@
 -include_lib("snmp/include/snmp_types.hrl").
 -include("snmpm_atl.hrl").
 -include("snmpm_internal.hrl").
+-include("snmp_verbosity.hrl").
 
 -define(DEFAULT_AGENT_PORT, 161).
 
@@ -447,8 +448,11 @@ agent_info(Addr, Port, Item) ->
 	    Error
     end.
 
+update_agent_info(UserId, TargetName, Info) when is_list(Info) ->
+    snmpm_config:update_agent_info(UserId, TargetName, Info).
+
 update_agent_info(UserId, TargetName, Item, Val) ->
-    snmpm_config:update_agent_info(UserId, TargetName, Item, Val).
+    update_agent_info(UserId, TargetName, [{Item, Val}]).
 
 %% Backward compatibility functions
 update_agent_info(UserId, Addr, Port, Item, Val) ->
diff --git a/lib/snmp/src/manager/snmpm_config.erl b/lib/snmp/src/manager/snmpm_config.erl
index fd6da3e71a..c2e57abddb 100644
--- a/lib/snmp/src/manager/snmpm_config.erl
+++ b/lib/snmp/src/manager/snmpm_config.erl
@@ -1,7 +1,7 @@
 %% 
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2004-2010. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2011. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -36,7 +36,8 @@
 	 user_info/0, user_info/1, user_info/2, 
 
 	 register_agent/3, unregister_agent/2, 
-	 agent_info/0, agent_info/2, agent_info/3, update_agent_info/4, 
+	 agent_info/0, agent_info/2, agent_info/3, 
+	 update_agent_info/3, update_agent_info/4, 
 	 which_agents/0, which_agents/1, 
 
 	 is_known_engine_id/2, 
@@ -84,7 +85,9 @@
 
 	 backup/1,
 
-	 mk_target_name/3
+	 mk_target_name/3,
+	 
+	 default_transport_domain/0
 
 	]).
 
@@ -127,23 +130,24 @@
 
 
 %% Macros and Constants:
--define(SERVER,    ?MODULE).
--define(BACKUP_DB, snmpm_config_backup).
--define(CONFIG_DB, snmpm_config_db).
+-define(SERVER,             ?MODULE).
+-define(BACKUP_DB,          snmpm_config_backup).
+-define(CONFIG_DB,          snmpm_config_db).
 
 -define(DEFAULT_USER,       default_user).
 
 -define(DEFAULT_AGENT_PORT, 161).
 
--define(IRB_DEFAULT, auto).
-%% -define(IRB_DEFAULT, {user, timer:seconds(15)}).
+-define(IRB_DEFAULT,        auto).
+%% -define(IRB_DEFAULT,        {user, timer:seconds(15)}).
 
--define(USER_MOD_DEFAULT,  snmpm_user_default).
--define(USER_DATA_DEFAULT, undefined).
+-define(USER_MOD_DEFAULT,   snmpm_user_default).
+-define(USER_DATA_DEFAULT,  undefined).
 
 %% -define(DEF_ADDR_TAG, default_addr_tag).
 -define(DEFAULT_TARGETNAME, default_agent).
--define(DEF_PORT_TAG, default_port_tag).
+-define(DEF_PORT_TAG,       default_port_tag).
+-define(SUPPORTED_DOMAINS,  [transportDomainUdpIpv4, transportDomainUdpIpv6]).
 
 -ifdef(snmp_debug).
 -define(GS_START_LINK(Opts),
@@ -159,6 +163,11 @@
 %%%-------------------------------------------------------------------
 %%% API
 %%%-------------------------------------------------------------------
+
+default_transport_domain() ->
+    transportDomainUdpIpv4.
+
+
 start_link(Opts) -> 
     ?d("start_link -> entry with"
        "~n   Opts: ~p", [Opts]),
@@ -269,9 +278,10 @@ do_user_info(_UserId, BadItem) ->
     error({not_found, BadItem}).
 
 
-%% A target-name constructed in this way is a string with the following 
+%% A target-name constructed in this way is a string with the following: 
 %% <IP-address>:<Port>-<Version>
-%% 
+%% This is intended for backward compatibility and therefor has
+%% only support for IPv4 addresses and *no* other transport domain.
 mk_target_name(Addr0, Port, Config) when is_list(Config) ->
     Version = 
 	case lists:keysearch(version, 1, Config) of
@@ -280,7 +290,6 @@ mk_target_name(Addr0, Port, Config) when is_list(Config) ->
 	    false ->
 		select_lowest_supported_version()
 	end,
-%%     p("mk_target_name -> Version: ~p", [Version]),
     case normalize_address(Addr0) of
 	{A, B, C, D} ->
 	    lists:flatten(
@@ -308,57 +317,99 @@ select_lowest_supported_version([H|T], Versions) ->
     end.
 
 
-register_agent(UserId, _TargetName, _Config) when (UserId =:= user_id) ->
+register_agent(UserId, _TargetName, _Config0) when (UserId =:= user_id) ->
     {error, {bad_user_id, UserId}};
-register_agent(UserId, TargetName, Config) 
+register_agent(UserId, TargetName, Config0) 
   when (is_list(TargetName) andalso 
 	(length(TargetName) > 0) andalso 
-	is_list(Config)) ->
+	is_list(Config0)) ->
 
-%%     p("register_agent -> entry with"
-%%       "~n   UserId:     ~p"
-%%       "~n   TargetName: ~p"
-%%       "~n   Config:     ~p", [UserId, TargetName, Config]),
+    ?vtrace("register_agent -> entry with"
+	    "~n   UserId:     ~p"
+	    "~n   TargetName: ~p"
+	    "~n   Config0:    ~p", [UserId, TargetName, Config0]),
 
     %% Check: 
     %%   1) That the mandatory configs are present
-    %%   2) That the illegal config user_id (used internally) is 
-    %%      not present
+    %%   2) That no illegal config, e.g. user_id (used internally), 
+    %%      is not present
     %%   3) Check that there are no invalid or erroneous configs
-    %%   4) Chack that the manager is capable to use the selected version
-    case verify_agent_config(Config) of
-	ok ->
+    %%   4) Check that the manager is capable of using the selected version
+    case verify_agent_config(Config0) of
+	{ok, Config} ->
 	    call({register_agent, UserId, TargetName, Config});
 	Error ->
 	    Error
     end.
 
 
-verify_agent_config(Conf) ->
-    ok = verify_mandatory(Conf, [engine_id, address, reg_type]),
-    case verify_invalid(Conf, [user_id]) of
-	ok ->
-	    case verify_agent_config2(Conf) of
-		ok ->
-		    {ok, Vsns} = system_info(versions),
-		    Vsn = 
-			case lists:keysearch(version, 1, Conf) of
-			    {value, {version, V}} ->
-				V;
-			    false ->
-				v1
-			end,
-		    case lists:member(Vsn, Vsns) of
-			true ->
-			    ok;
-			false ->
-			    {error, {version_not_supported_by_manager, Vsn, Vsns}}
-		    end
-	    end;
-	Error ->
+verify_agent_config(Conf0) ->
+    try
+	begin
+	    verify_mandatory(Conf0, [engine_id, address, reg_type]),
+	    verify_invalid(Conf0, [user_id]),
+	    Conf = verify_agent_config3(Conf0),
+	    Vsns = versions(),
+	    Vsn  = which_version(Conf),
+	    verify_version(Vsn, Vsns),
+	    {ok, Conf}
+	end
+    catch
+	throw:Error ->
 	    Error
     end.
 
+versions() ->
+    case system_info(versions) of
+	{ok, Vsns} ->
+	    Vsns;
+	{error, _} = ERROR ->
+	    throw(ERROR)
+    end.
+
+which_version(Conf) ->
+    case lists:keysearch(version, 1, Conf) of
+	{value, {version, V}} ->
+	    V;
+	false ->
+	    v1
+    end.
+
+verify_version(Vsn, Vsns) ->
+    case lists:member(Vsn, Vsns) of
+	true ->
+	    ok;
+	false ->
+	    Reason = {version_not_supported_by_manager, Vsn, Vsns}, 
+	    throw({error, Reason})
+    end.
+
+verify_agent_config3(Conf0) ->
+    %% Fix (transport) address and domain
+    {TDomain, Conf1} = 
+	case lists:keysearch(tdomain, 1, Conf0) of
+	    {value, {tdomain, Dom}} ->
+		{Dom, Conf0};
+	    false ->
+		Dom = default_transport_domain(), 
+		{Dom, [{tdomain, Dom} | Conf0]}
+	end,
+    Conf2 = case lists:keysearch(address, 1, Conf1) of
+		{value, {address, Address}} ->
+		    lists:keyreplace(address, 1, Conf1, 
+				     {address, {TDomain, Address}});
+		false ->
+		    %% This is a mandatory config option, 
+		    %% a later test will detect this
+		    Conf1
+	    end,
+    case verify_agent2(Conf2) of
+	{ok, Conf} ->
+	    Conf;
+	{error, _} = ERROR ->
+	    throw(ERROR)
+    end.
+
 verify_agent_config2(Conf) ->
     verify_agent2(Conf).
 
@@ -366,6 +417,7 @@ verify_agent_config2(Conf) ->
 unregister_agent(UserId, TargetName) ->
     call({unregister_agent, UserId, TargetName}).
 
+%% This is the old style agent unregistration (using Addr and Port).
 unregister_agent(UserId, Addr0, Port) ->
     Addr = normalize_address(Addr0),
     case do_agent_info(Addr, Port, target_name) of
@@ -421,17 +473,51 @@ which_agents(UserId) ->
     Agents = ets:match(snmpm_agent_table, Pat),
     [TargetName || [TargetName] <- Agents].
 
-    
-update_agent_info(UserId, TargetName, Item, Val0) 
-  when (Item =/= user_id) ->
-    case (catch verify_val(Item, Val0)) of
-	{ok, Val} ->
-	    call({update_agent_info, UserId, TargetName, Item, Val});
-	Error ->
+
+verify_agent_info(TargetName, Info0) ->
+    try 
+	begin
+	    verify_invalid(Info0, [user_id]), 
+	    %% Check if address is part of the list and
+	    %% if so update it with the domain info. 
+	    Info = 
+		case lists:keysearch(address, 1, Info0) of
+		    {value, {address, Addr}} ->
+			%% If domain is part of the info, then use it.
+			%% If not, lookup what is already stored for 
+			%% this agent and use that.
+			Domain = 
+			    case lists:keysearch(tdomain, 1, Info0) of
+				{value, {tdomain, Dom}} ->
+				    Dom;
+				false ->
+				    {ok, Dom} = 
+					agent_info(TargetName, tdomain),
+				    Dom
+			    end,
+			Addr2 = {Domain, Addr}, 
+			lists:keyreplace(address, 1, Info0, {address, Addr2});
+		    false ->
+			Info0
+		end,
+	    verify_agent2(Info)
+	end
+    catch
+	throw:Error ->
 	    Error
     end.
 
-%% Backward compatibillity
+update_agent_info(UserId, TargetName, Info) ->
+    call({update_agent_info, UserId, TargetName, Info}).
+
+%% <BACKWARD-COMPAT-2>
+%% This is wrapped in the interface module, so this function is
+%% only here to catch code-upgrade problems.
+update_agent_info(UserId, TargetName, Item, Val) ->
+    update_agent_info(UserId, TargetName, [{Item, Val}]).
+%% </BACKWARD-COMPAT-2>
+
+%% <BACKWARD-COMPAT-1>
 update_agent_info(UserId, Addr, Port, Item, Val)  ->
     case agent_info(Addr, Port, target_name) of
 	{ok, TargetName} ->
@@ -439,6 +525,7 @@ update_agent_info(UserId, Addr, Port, Item, Val)  ->
 	Error ->
 	    Error
     end.
+%% </BACKWARD-COMPAT-1>
 
 is_known_engine_id(EngineID, TargetName) ->
     case agent_info(TargetName, engine_id) of
@@ -650,22 +737,14 @@ unregister_usm_user(EngineID, Name)
     call({unregister_usm_user, EngineID, Name}).
 
 verify_usm_user_config(EngineID, Name, Config) ->
-    %%     case verify_mandatory(Config, []) of
-    %% 	ok ->
-    %% 	    case verify_invalid(Config, [engine_id, name]) of
-    %% 		ok ->
-    %% 		    verify_usm_user_config2(EngineID, Name, Config);
-    %% 		Error ->
-    %% 		    Error
-    %% 	    end;
-    %% 	Error ->
-    %% 	    Error
-    %%     end.
-    ok = verify_mandatory(Config, []),
-    case verify_invalid(Config, [engine_id, name]) of
-	ok ->
-	    verify_usm_user_config2(EngineID, Name, Config);
-	Error ->
+    try
+	begin
+	    verify_mandatory(Config, []), 
+	    verify_invalid(Config, [engine_id, name]),
+	    verify_usm_user_config2(EngineID, Name, Config)
+	end
+    catch 
+	throw:Error ->
 	    Error
     end.
 
@@ -1590,6 +1669,7 @@ check_agent_config2(Agent) ->
 	    throw(Err)
     end.
 
+%% For backward compatibility
 check_agent_config({UserId, 
 		    TargetName, 
 		    Community, 
@@ -1597,10 +1677,27 @@ check_agent_config({UserId,
 		    EngineId, 
 		    Timeout, MaxMessageSize, 
 		    Version, SecModel, SecName, SecLevel}) ->
+    TDomain = default_transport_domain(),
+    check_agent_config({UserId, 
+			TargetName, 
+			Community, 
+			TDomain, Ip, Port, 
+			EngineId, 
+			Timeout, MaxMessageSize, 
+			Version, SecModel, SecName, SecLevel});
+
+check_agent_config({UserId, 
+		    TargetName, 
+		    Community, 
+		    TDomain, Ip, Port, 
+		    EngineId, 
+		    Timeout, MaxMessageSize, 
+		    Version, SecModel, SecName, SecLevel}) ->
     ?vtrace("check_agent_config -> entry with"
 	    "~n   UserId:         ~p"
 	    "~n   TargetName:     ~p"
 	    "~n   Community:      ~p"
+	    "~n   TDomain:        ~p"
 	    "~n   Ip:             ~p"
 	    "~n   Port:           ~p"
 	    "~n   EngineId:       ~p"
@@ -1610,15 +1707,16 @@ check_agent_config({UserId,
 	    "~n   SecModel:       ~p"
 	    "~n   SecName:        ~p"
 	    "~n   SecLevel:       ~p", 
-	    [UserId, TargetName, Community, Ip, Port, 
+	    [UserId, TargetName, Community, 
+	     TDomain, Ip, Port, 
 	     EngineId, Timeout, MaxMessageSize, 
 	     Version, SecModel, SecName, SecLevel]),
-    Addr = normalize_address(Ip),
+    Addr = normalize_address(TDomain, Ip),
     ?vtrace("check_agent_config -> Addr: ~p", [Addr]),
     Agent = {UserId, 
 	     TargetName, 
 	     Community, 
-	     Addr, Port, 
+	     TDomain, Addr, Port, 
 	     EngineId, 
 	     Timeout, MaxMessageSize, 
 	     Version, SecModel, SecName, SecLevel},
@@ -1644,6 +1742,7 @@ init_agent_config({UserId, TargetName, Config}) ->
     end.
 
 
+%% For backward compatibility
 verify_agent({UserId, 
 	      TargetName, 
 	      Comm, 
@@ -1651,48 +1750,68 @@ verify_agent({UserId,
 	      EngineId, 
 	      Timeout, MMS, 
 	      Version, SecModel, SecName, SecLevel}) ->
-    ?vtrace("verify_agent -> entry with"
+    TDomain = default_transport_domain(),
+    verify_agent({UserId, 
+		  TargetName, 
+		  Comm, 
+		  TDomain, Ip, Port, 
+		  EngineId, 
+		  Timeout, MMS, 
+		  Version, SecModel, SecName, SecLevel});
+
+verify_agent({UserId, 
+	      TargetName, 
+	      Comm, 
+	      TDomain, Ip, Port, 
+	      EngineId, 
+	      Timeout, MMS, 
+	      Version, SecModel, SecName, SecLevel}) ->
+    ?vdebug("verify_agent -> entry with"
 	    "~n   UserId:     ~p"
 	    "~n   TargetName: ~p", [UserId, TargetName]),
     snmp_conf:check_string(TargetName, {gt, 0}),
-    case verify_val(address, Ip) of
-	{ok, Addr} ->
-	    snmp_conf:check_integer(Port, {gt, 0}),
-	    Conf = 
-		[{reg_type,         target_name},
-		 {address,          Addr},
-		 {port,             Port},
-		 {community,        Comm}, 
-		 {engine_id,        EngineId},
-		 {timeout,          Timeout},
-		 {max_message_size, MMS},
-		 {version,          Version},
-		 {sec_model,        SecModel},
-		 {sec_name,         SecName},
-		 {sec_level,        SecLevel}
-		],
-	    case verify_agent2(Conf) of
-		ok ->
-		    {UserId, TargetName, Conf, Version};
-		Err ->
-		    throw(Err)
-	    end;
-	
-	Error ->
-	    ?vlog("verify_agent -> failed: ~n   ~p", [Error]),
-	    throw(Error)
+    snmp_conf:check_integer(Port, {gt, 0}),
+    %% Note that the order of Conf *is* important.
+    %% Some properties may depend on others, so that
+    %% in order to verify one property, another must
+    %% be already verified (and present). An example 
+    %% of this is the property 'address', for which
+    %% the property tdomain is needed.
+    Conf0 = 
+	[{reg_type,         target_name},
+	 {tdomain,          TDomain}, 
+	 %% This should be taddress, but what the*...
+	 {address,          {TDomain, Ip}},
+	 {port,             Port},
+	 {community,        Comm}, 
+	 {engine_id,        EngineId},
+	 {timeout,          Timeout},
+	 {max_message_size, MMS},
+	 {version,          Version},
+	 {sec_model,        SecModel},
+	 {sec_name,         SecName},
+	 {sec_level,        SecLevel}
+	],
+    case verify_agent2(Conf0) of
+	{ok, Conf} ->
+	    {UserId, TargetName, Conf, Version};
+	Err ->
+	    throw(Err)
     end.
 
-verify_agent2([]) ->
-    ok;
-verify_agent2([{Item, Val}|Items]) ->
-    case verify_val(Item, Val) of
-	{ok, _Val} ->
-	    verify_agent2(Items);
+verify_agent2(Conf) -> 
+    verify_agent2(Conf, []).
+
+verify_agent2([], VerifiedConf) ->
+    {ok, VerifiedConf};
+verify_agent2([{Item, Val0}|Items], VerifiedConf) ->
+    case verify_val(Item, Val0) of
+	{ok, Val} ->
+	    verify_agent2(Items, [{Item, Val} | VerifiedConf]);
 	Err ->
 	    Err
     end;
-verify_agent2([Bad|_]) ->
+verify_agent2([Bad|_], _VerifiedConf) ->
     {error, {bad_agent_config, Bad}}.
 
 
@@ -1708,14 +1827,28 @@ read_users_config_file(Dir) ->
 
 
 check_user_config({Id, Mod, Data}) ->
+    ?vtrace("check_user_config -> entry with"
+	    "~n   Id:   ~p"
+	    "~n   Mod:  ~p"
+	    "~n   Data: ~p", [Id, Mod, Data]),
     check_user_config({Id, Mod, Data, []});
-check_user_config({Id, Mod, _Data, DefaultAgentConfig} = User) 
+check_user_config({Id, Mod, Data, DefaultAgentConfig} = _User) 
   when (Id =/= ?DEFAULT_USER) andalso is_list(DefaultAgentConfig) ->
+    ?vtrace("check_user_config -> entry with"
+	    "~n   Id:                 ~p"
+	    "~n   Mod:                ~p"
+	    "~n   Data:               ~p"
+	    "~n   DefaultAgentConfig: ~p", 
+	    [Id, Mod, Data, DefaultAgentConfig]),
     case (catch verify_user_behaviour(Mod)) of
 	ok ->
+	    ?vtrace("check_user_config -> user behaviour verified", []),
 	    case verify_user_agent_config(DefaultAgentConfig) of
-		ok ->
-	    	    {ok, User};
+		{ok, DefAgentConf} ->
+		    ?vtrace("check_user_config -> "
+			    "user agent (default) config verified", []),
+		    User2 = {Id, Mod, Data, DefAgentConf}, 
+	    	    {ok, User2};
 		{error, Reason} ->
 		    error({bad_default_agent_config, Reason})
 	    end;
@@ -1756,16 +1889,16 @@ verify_user({Id, UserMod, UserData}) ->
 verify_user({Id, UserMod, UserData, DefaultAgentConfig}) 
   when (Id =/= ?DEFAULT_USER) andalso is_list(DefaultAgentConfig) ->
     ?d("verify_user -> entry with"
-       "~n   Id:       ~p"
-       "~n   UserMod:  ~p"
-       "~n   UserData: ~p"
+       "~n   Id:                 ~p"
+       "~n   UserMod:            ~p"
+       "~n   UserData:           ~p"
        "~n   DefaultAgentConfig: ~p", 
        [Id, UserMod, UserData, DefaultAgentConfig]),
     case (catch verify_user_behaviour(UserMod)) of
 	ok ->
 	    case verify_user_agent_config(DefaultAgentConfig) of
-		ok ->
-		    Config = default_agent_config(DefaultAgentConfig),
+		{ok, DefAgentConf} ->
+		    Config = default_agent_config(DefAgentConf),
 		    {ok, #user{id                   = Id, 
 			       mod                  = UserMod, 
 			       data                 = UserData, 
@@ -1783,10 +1916,15 @@ verify_user({Id, _, _, _}) ->
     {error, {bad_user_id, Id}}.
 
 verify_user_agent_config(Conf) ->
-    case verify_invalid(Conf, [user_id, engine_id, address]) of
-	ok ->
-	    verify_agent_config2(Conf);
-	Error ->
+    try
+	begin
+	    verify_invalid(Conf, [user_id, engine_id, address]),
+	    verify_agent_config2(Conf)
+	end
+    catch
+	throw:Error ->
+	    ?vdebug("verify_user_agent_config -> throw"
+		    "~n   Error: ~p", [Error]),
 	    Error
     end.
 
@@ -2147,6 +2285,16 @@ handle_call({unregister_agent, UserId, TargetName}, _From, State) ->
     Reply = handle_unregister_agent(UserId, TargetName),
     {reply, Reply, State};
 
+handle_call({update_agent_info, UserId, TargetName, Info}, 
+	    _From, State) ->
+    ?vlog("received update_agent_info request: "
+	  "~n   UserId:     ~p"
+	  "~n   TargetName: ~p"
+	  "~n   Info:       ~p", [UserId, TargetName, Info]),
+    Reply = handle_update_agent_info(UserId, TargetName, Info),
+    {reply, Reply, State};
+
+%% <BACKWARD-COMPAT>
 handle_call({update_agent_info, UserId, TargetName, Item, Val}, 
 	    _From, State) ->
     ?vlog("received update_agent_info request: "
@@ -2156,6 +2304,7 @@ handle_call({update_agent_info, UserId, TargetName, Item, Val},
 	  "~n   Val:        ~p", [UserId, TargetName, Item, Val]),
     Reply = handle_update_agent_info(UserId, TargetName, Item, Val),
     {reply, Reply, State};
+%% </BACKWARD-COMPAT>
 
 handle_call({register_usm_user, User}, _From, State) ->
     ?vlog("received register_usm_user request: "
@@ -2517,16 +2666,27 @@ handle_register_agent(UserId, TargetName, Config) ->
 	    "~n   Config:     ~p", [UserId, TargetName, Config]),
     case (catch agent_info(TargetName, user_id)) of
 	{error, _} ->
+	    ?vtrace("handle_register_agent -> user_id not found in config", []),
 	    case ets:lookup(snmpm_user_table, UserId) of
 		[#user{default_agent_config = DefConfig}] ->
+		    ?vtrace("handle_register_agent -> "
+			    "~n   DefConfig: ~p", [DefConfig]),
+		    %% First, insert this users default config
+		    ?vtrace("handle_register_agent -> store default config", []),
 		    do_handle_register_agent(TargetName, DefConfig),
+		    %% Second, insert the config for this agent
+		    ?vtrace("handle_register_agent -> store config", []),
 		    do_handle_register_agent(TargetName, 
 					     [{user_id, UserId}|Config]),
 		    %% <DIRTY-BACKWARD-COMPATIBILLITY>
 		    %% And now for some (backward compatibillity) 
 		    %% dirty crossref stuff
+		    ?vtrace("handle_register_agent -> lookup address", []),
 		    {ok, Addr} = agent_info(TargetName, address),
+		    ?vtrace("handle_register_agent -> Addr: ~p, lookup Port", 
+			    [Addr]),
 		    {ok, Port} = agent_info(TargetName, port),
+		    ?vtrace("handle_register_agent -> register cross-ref fix", []),
 		    ets:insert(snmpm_agent_table, 
 			       {{Addr, Port, target_name}, TargetName}),
 		    %% </DIRTY-BACKWARD-COMPATIBILLITY>
@@ -2551,10 +2711,18 @@ handle_register_agent(UserId, TargetName, Config) ->
 do_handle_register_agent(_TargetName, []) ->
     ok;
 do_handle_register_agent(TargetName, [{Item, Val}|Rest]) ->
+    ?vtrace("handle_register_agent -> entry with"
+	    "~n   TargetName: ~p"
+	    "~n   Item:       ~p"
+	    "~n   Val:        ~p"
+	    "~n   Rest:       ~p", [TargetName, Item, Val, Rest]),
     case (catch do_update_agent_info(TargetName, Item, Val)) of
 	ok ->
 	    do_handle_register_agent(TargetName, Rest);
 	{error, Reason} ->
+	    ?vtrace("handle_register_agent -> failed updating ~p"
+		    "~n   Item:   ~p"
+		    "~n   Reason: ~p", [Item, Reason]),
 	    ets:match_delete(snmpm_agent_table, {TargetName, '_'}),
 	    {error, Reason}
     end;
@@ -2589,41 +2757,61 @@ handle_unregister_agent(UserId, TargetName) ->
     end.
 
 
-handle_update_agent_info(UserId, TargetName, Item, Val) ->
+handle_update_agent_info(UserId, TargetName, Info) ->
     ?vdebug("handle_update_agent_info -> entry with"
 	    "~n   UserId:     ~p"
 	    "~n   TargetName: ~p"
-	    "~n   Item:       ~p"
-	    "~n   Val:        ~p", [UserId, TargetName, Item, Val]),
+	    "~n   Info:       ~p", [UserId, TargetName, Info]),
+    %% Verify ownership
     case (catch agent_info(TargetName, user_id)) of
-	{ok, UserId} ->
-	    do_update_agent_info(TargetName, Item, Val);
+	{ok, UserId} -> 
+	    handle_update_agent_info(TargetName, Info);
 	{ok, OtherUserId} ->
 	    {error, {not_owner, OtherUserId}};
 	Error ->
 	    Error
     end.
 
-do_update_agent_info(TargetName, Item, Val0) ->
-%%     p("do_update_agent_info -> entry with"
-%%       "~n   TargetName: ~p"
-%%       "~n   Item:       ~p"
-%%       "~n   Val0:       ~p", [TargetName, Item, Val0]),
-    case verify_val(Item, Val0) of
-	{ok, Val} ->
-%% 	    p("do_update_agent_info -> verified value"
-%% 	      "~n   Val: ~p", [Val]),
-	    ets:insert(snmpm_agent_table, {{TargetName, Item}, Val}),
-	    ok;
+handle_update_agent_info(TargetName, Info0) ->
+    ?vtrace("handle_update_agent_info -> entry with"
+	    "~n   TargetName: ~p"
+	    "~n   Info0:      ~p", [TargetName, Info0]),
+    %% Verify info
+    try verify_agent_info(TargetName, Info0) of
+	{ok, Info} -> 
+	    do_update_agent_info(TargetName, Info);
 	Error ->
-	    ?vlog("do_update_agent_info -> verify value failed: "
-		  "~n   TargetName: ~p"
-		  "~n   Item:       ~p"
-		  "~n   Val0:       ~p"
-		  "~n   Error:      ~p", [TargetName, Item, Val0, Error]),
-	    {error, {bad_agent_val, TargetName, Item, Val0}}
+	    Error
+    catch 
+	throw:Error ->
+	    Error;
+	T:E ->
+	    {error, {failed_info_verification, Info0, T, E}}
     end.
 
+handle_update_agent_info(UserId, TargetName, Item, Val) ->
+    ?vdebug("handle_update_agent_info -> entry with"
+	    "~n   UserId:     ~p"
+	    "~n   TargetName: ~p"
+	    "~n   Item:       ~p"
+	    "~n   Val:        ~p", [UserId, TargetName, Item, Val]),
+    handle_update_agent_info(TargetName, [{Item, Val}]).
+
+do_update_agent_info(TargetName, Info) ->
+    InsertItem = 
+	fun({Item, Val}) -> 
+		ets:insert(snmpm_agent_table, {{TargetName, Item}, Val})
+	end,
+    lists:foreach(InsertItem, Info).
+
+do_update_agent_info(TargetName, Item, Val) ->
+    ?vtrace("do_update_agent_info -> entry with"
+	    "~n   TargetName: ~p"
+	    "~n   Item:       ~p"
+	    "~n   Val:       ~p", [TargetName, Item, Val]),
+    ets:insert(snmpm_agent_table, {{TargetName, Item}, Val}),
+    ok.
+
 
 handle_register_usm_user(#usm_user{engine_id = EngineID, 
 				   name      = Name} = User) ->
@@ -2791,7 +2979,7 @@ verify_mandatory(Conf, [Mand|Mands]) ->
 	true ->
 	    verify_mandatory(Conf, Mands);
 	false ->
-	    {error, {missing_mandatory_config, Mand}}
+	    throw({error, {missing_mandatory_config, Mand}})
     end.
 
 verify_invalid(_, []) ->
@@ -2801,7 +2989,7 @@ verify_invalid(Conf, [Inv|Invs]) ->
 	false ->
 	    verify_invalid(Conf, Invs);
 	true ->
-	    {error, {illegal_config, Inv}}
+	    throw({error, {illegal_config, Inv}})
     end.
 
 
@@ -2810,10 +2998,26 @@ verify_val(user_id, UserId) ->
 verify_val(reg_type, RegType) 
   when (RegType =:= addr_port) orelse (RegType =:= target_name) ->
     {ok, RegType};
-verify_val(address, Addr0) ->
-    case normalize_address(Addr0) of
+verify_val(tdomain = Item, snmpUDPDomain = _Domain) ->
+    verify_val(Item, transportDomainUdpIpv4);
+verify_val(tdomain, Domain) ->
+    case lists:member(Domain, ?SUPPORTED_DOMAINS) of
+	true ->
+	    {ok, Domain};
+	false ->
+	    case lists:member(Domain, snmp_conf:all_domains()) of
+		true ->
+		    error({unsupported_domain, Domain});
+		false ->
+		    error({unknown_domain, Domain})
+	    end
+    end;
+verify_val(address, {Domain, Addr0}) ->
+    case normalize_address(Domain, Addr0) of
 	{_A1, _A2, _A3, _A4} = Addr ->
 	    {ok, Addr};
+	{_A1, _A2, _A3, _A4, _A5, _A6, _A7, _A8} = Addr ->
+	    {ok, Addr};
 	_ when is_list(Addr0) ->
 	    case (catch snmp_conf:check_ip(Addr0)) of
 		ok ->
@@ -2824,6 +3028,8 @@ verify_val(address, Addr0) ->
 	_ ->
 	    error({bad_address, Addr0})
     end;
+verify_val(address, BadAddress) ->
+    error({bad_address, BadAddress});
 verify_val(port, Port) ->
     case (catch snmp_conf:check_integer(Port, {gt, 0})) of
 	ok ->
@@ -2875,7 +3081,7 @@ verify_val(sec_name, BadName) ->
 verify_val(sec_level, Level) ->
     (catch snmp_conf:check_sec_level(Level));
 verify_val(Item, _) ->
-    {error, {no_such_item, Item}}.
+    {error, {unknown_item, Item}}.
 
 
 %%%-------------------------------------------------------------------
@@ -3034,11 +3240,17 @@ init_mini_mib_elems(MibName, [_|T], Res) ->
 %%----------------------------------------------------------------------
 
 normalize_address(Addr) ->
-    case inet:getaddr(Addr, inet) of
+    normalize_address(snmpUDPDomain, Addr).
+
+normalize_address(snmpUDPDomain, Addr) ->
+    normalize_address(transportDomainUdpIpv4, Addr);
+
+normalize_address(Domain, Addr) ->
+    case inet:getaddr(Addr, td2fam(Domain)) of
         {ok, Addr2} ->
             Addr2;
         _ when is_list(Addr) ->
-	    case (catch snmp_conf:check_ip(Addr)) of
+	    case (catch snmp_conf:check_ip(Domain, Addr)) of
 		ok ->
 		    list_to_tuple(Addr);
 		_ ->
@@ -3048,6 +3260,9 @@ normalize_address(Addr) ->
             Addr
     end.
 
+td2fam(transportDomainUdpIpv4) -> inet;
+td2fam(transportDomainUdpIpv6) -> inet6.
+    
 
 %%----------------------------------------------------------------------
 
diff --git a/lib/snmp/src/manager/snmpm_mpd.erl b/lib/snmp/src/manager/snmpm_mpd.erl
index 7712370d28..627838e3d4 100644
--- a/lib/snmp/src/manager/snmpm_mpd.erl
+++ b/lib/snmp/src/manager/snmpm_mpd.erl
@@ -92,7 +92,7 @@ reset(#state{v3 = V3}) ->
 %% Purpose: This is the main Message Dispatching function. (see
 %%          section 4.2.1 in rfc2272)
 %%-----------------------------------------------------------------
-process_msg(Msg, TDomain, Addr, Port, State, NoteStore, Logger) ->
+process_msg(Msg, Domain, Addr, Port, State, NoteStore, Logger) ->
 
     inc(snmpInPkts),
 
@@ -102,18 +102,18 @@ process_msg(Msg, TDomain, Addr, Port, State, NoteStore, Logger) ->
 	#message{version = 'version-1', vsn_hdr = Community, data = Data} 
 	  when State#state.v1 =:= true ->
 	    HS = ?empty_msg_size + length(Community),
-	    process_v1_v2c_msg('version-1', NoteStore, Msg, TDomain, 
-			       Addr, Port, 
+	    process_v1_v2c_msg('version-1', NoteStore, Msg, 
+			       Domain, Addr, Port, 
 			       Community, Data, HS, Logger);
 
 	%% Version 2
 	#message{version = 'version-2', vsn_hdr = Community, data = Data}
 	  when State#state.v2c =:= true ->
 	    HS = ?empty_msg_size + length(Community),
-	    process_v1_v2c_msg('version-2', NoteStore, Msg, TDomain, 
-			       Addr, Port, 
-			       Community, Data, HS, Logger);
-
+	    (catch process_v1_v2c_msg('version-2', NoteStore, Msg, 
+				      Domain, Addr, Port, 
+				      Community, Data, HS, Logger));
+	     
 	%% Version 3
 	#message{version = 'version-3', vsn_hdr = H, data = Data}
 	  when State#state.v3 =:= true ->
@@ -148,17 +148,30 @@ process_msg(Msg, TDomain, Addr, Port, State, NoteStore, Logger) ->
 %%-----------------------------------------------------------------
 %% Handles a Community based message (v1 or v2c).
 %%-----------------------------------------------------------------
-process_v1_v2c_msg(Vsn, _NoteStore, Msg, snmpUDPDomain, 
+process_v1_v2c_msg(Vsn, _NoteStore, Msg, Domain, 
 		   Addr, Port, 
 		   Community, Data, HS, Log) ->
 
     ?vdebug("process_v1_v2c_msg -> entry with"
 	    "~n   Vsn:       ~p"
+	    "~n   Domain:    ~p"
 	    "~n   Addr:      ~p"
 	    "~n   Port:      ~p"
 	    "~n   Community: ~p"
-	    "~n   HS:        ~p", [Vsn, Addr, Port, Community, HS]),
+	    "~n   HS:        ~p", [Vsn, Domain, Addr, Port, Community, HS]),
     
+    {TDomain, TAddress} = 
+	try 
+	    begin
+		TD = snmp_conf:mk_tdomain(Domain), 
+		TA = snmp_conf:mk_taddress(Domain, Addr, Port),
+		{TD, TA}
+	    end
+	catch 
+	    throw:{error, TReason} ->
+		throw({discarded, {badarg, Domain, TReason}})
+	end,
+
     Max      = get_max_message_size(),
     AgentMax = get_agent_max_message_size(Addr, Port),
     PduMS    = pdu_ms(Max, AgentMax, HS),
@@ -170,14 +183,14 @@ process_v1_v2c_msg(Vsn, _NoteStore, Msg, snmpUDPDomain,
 	    ?vtrace("process_v1_v2c_msg -> was a pdu", []),
 	    Log(Msg),
 	    inc_snmp_in(Pdu),
-	    MsgData = {Community, sec_model(Vsn)},
+	    MsgData = {Community, sec_model(Vsn), TDomain, TAddress},
 	    {ok, Vsn, Pdu, PduMS, MsgData};
 
 	Trap when is_record(Trap, trappdu) ->
 	    ?vtrace("process_v1_v2c_msg -> was a trap", []),
 	    Log(Msg),
 	    inc_snmp_in(Trap),
-	    MsgData = {Community, sec_model(Vsn)},
+	    MsgData = {Community, sec_model(Vsn), TDomain, TAddress},
 	    {ok, Vsn, Trap, PduMS, MsgData};
 
 	{'EXIT', Reason} ->
@@ -185,11 +198,7 @@ process_v1_v2c_msg(Vsn, _NoteStore, Msg, snmpUDPDomain,
 		  "~n   Reason: ~p", [Reason]),
 	    inc(snmpInASNParseErrs),
 	    {discarded, Reason}
-    end;
-process_v1_v2c_msg(_Vsn, _NoteStore, _Msg, TDomain, 
-		   _Addr, _Port, 
-		   _Comm, _HS, _Data, _Log) ->
-    {discarded, {badarg, TDomain}}.
+    end.
 
 pdu_ms(MgrMMS, AgentMMS, HS) when AgentMMS < MgrMMS ->
     AgentMMS - HS;
@@ -482,8 +491,8 @@ generate_msg('version-3', NoteStore, Pdu,
     generate_v3_msg(NoteStore, Pdu, 
 		    SecModel, SecName, SecLevel, CtxEngineID, CtxName, 
 		    TargetName, Log);
-generate_msg(Vsn, _NoteStore, Pdu, {Community, _SecModel}, Log) ->
-    generate_v1_v2c_msg(Vsn, Pdu, Community, Log).
+generate_msg(Vsn, _NoteStore, Pdu, {Comm, _SecModel}, Log) ->
+    generate_v1_v2c_msg(Vsn, Pdu, Comm, Log).
 
 
 generate_v3_msg(NoteStore, Pdu, 
@@ -627,6 +636,8 @@ generate_response_msg('version-3', Pdu,
     generate_v3_response_msg(Pdu, MsgID, SecModel, SecName, SecLevel, 
 			     CtxEngineID, CtxName, SecData, Log);
 generate_response_msg(Vsn, Pdu, {Comm, _SecModel}, Log) ->
+    generate_v1_v2c_response_msg(Vsn, Pdu, Comm, Log);
+generate_response_msg(Vsn, Pdu, {Comm, _SecModel, _TDomain, _TAddress}, Log) ->
     generate_v1_v2c_response_msg(Vsn, Pdu, Comm, Log).
 
 
diff --git a/lib/snmp/src/manager/snmpm_net_if.erl b/lib/snmp/src/manager/snmpm_net_if.erl
index a116c9f26b..4d6bd9aa33 100644
--- a/lib/snmp/src/manager/snmpm_net_if.erl
+++ b/lib/snmp/src/manager/snmpm_net_if.erl
@@ -28,7 +28,8 @@
 	 start_link/2, 
 	 stop/1, 
 	 send_pdu/6, % Backward compatibillity
-	 send_pdu/7,
+	 send_pdu/7, % Backward compatibillity
+	 send_pdu/8,
 
 	 inform_response/4, 
 
@@ -101,16 +102,21 @@ stop(Pid) ->
 send_pdu(Pid, Pdu, Vsn, MsgData, Addr, Port) ->
     send_pdu(Pid, Pdu, Vsn, MsgData, Addr, Port, ?DEFAULT_EXTRA_INFO).
 
-send_pdu(Pid, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo) 
+send_pdu(Pid, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo) ->
+    Domain = snmpm_config:default_transport_domain(), 
+    send_pdu(Pid, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo).
+
+send_pdu(Pid, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo) 
   when is_record(Pdu, pdu) ->
     ?d("send_pdu -> entry with"
        "~n   Pid:     ~p"
        "~n   Pdu:     ~p"
        "~n   Vsn:     ~p"
        "~n   MsgData: ~p"
+       "~n   Domain:  ~p"
        "~n   Addr:    ~p"
-       "~n   Port:    ~p", [Pid, Pdu, Vsn, MsgData, Addr, Port]),
-    cast(Pid, {send_pdu, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo}).
+       "~n   Port:    ~p", [Pid, Pdu, Vsn, MsgData, Domain, Addr, Port]),
+    cast(Pid, {send_pdu, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo}).
 
 note_store(Pid, NoteStore) ->
     call(Pid, {note_store, NoteStore}).
@@ -380,15 +386,17 @@ handle_call(Req, From, State) ->
 %%          {noreply, State, Timeout} |
 %%          {stop, Reason, State}            (terminate/2 is called)
 %%--------------------------------------------------------------------
-handle_cast({send_pdu, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo}, State) ->
+handle_cast({send_pdu, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo}, 
+	    State) ->
     ?vlog("received send_pdu message with"
 	  "~n   Pdu:     ~p"
 	  "~n   Vsn:     ~p"
 	  "~n   MsgData: ~p"
+	  "~n   Domain:  ~p"
 	  "~n   Addr:    ~p"
-	  "~n   Port:    ~p", [Pdu, Vsn, MsgData, Addr, Port]),
+	  "~n   Port:    ~p", [Pdu, Vsn, MsgData, Domain, Addr, Port]),
     maybe_process_extra_info(ExtraInfo), 
-    maybe_handle_send_pdu(Pdu, Vsn, MsgData, Addr, Port, State), 
+    maybe_handle_send_pdu(Pdu, Vsn, MsgData, Domain, Addr, Port, State), 
     {noreply, State};
 
 handle_cast({inform_response, Ref, Addr, Port}, State) ->
@@ -545,8 +553,9 @@ handle_recv_msg(Addr, Port, Bytes,
 		       mpd_state  = MpdState, 
 		       sock       = Sock,
 		       log        = Log} = State) ->
+    Domain = snmp_conf:which_domain(Addr), % What the ****...
     Logger = logger(Log, read, Addr, Port),
-    case (catch snmpm_mpd:process_msg(Bytes, snmpUDPDomain, Addr, Port, 
+    case (catch snmpm_mpd:process_msg(Bytes, Domain, Addr, Port, 
 				      MpdState, NoteStore, Logger)) of
 
 	{ok, Vsn, Pdu, MS, ACM} ->
@@ -734,17 +743,17 @@ irgc_stop(Ref) ->
     (catch erlang:cancel_timer(Ref)).
 
 
-maybe_handle_send_pdu(Pdu, Vsn, MsgData, Addr, Port, 
+maybe_handle_send_pdu(Pdu, Vsn, MsgData, Domain, Addr, Port, 
 		      #state{filter = FilterMod} = State) ->
     case (catch FilterMod:accept_send_pdu(Addr, Port, pdu_type_of(Pdu))) of
 	false ->
 	    inc(netIfPduOutDrops),
 	    ok;
 	_ ->
-	    handle_send_pdu(Pdu, Vsn, MsgData, Addr, Port, State)
+	    handle_send_pdu(Pdu, Vsn, MsgData, Domain, Addr, Port, State)
     end.
 
-handle_send_pdu(Pdu, Vsn, MsgData, Addr, Port, 
+handle_send_pdu(Pdu, Vsn, MsgData, _Domain, Addr, Port, 
 		#state{server     = Pid, 
 		       note_store = NoteStore, 
 		       sock       = Sock, 
diff --git a/lib/snmp/src/manager/snmpm_server.erl b/lib/snmp/src/manager/snmpm_server.erl
index 58a58507d6..484954addb 100644
--- a/lib/snmp/src/manager/snmpm_server.erl
+++ b/lib/snmp/src/manager/snmpm_server.erl
@@ -161,7 +161,8 @@
 	{id, 
 	 user_id,
 	 reg_type,
-	 target, 
+	 target,
+	 domain,
 	 addr, 
 	 port, 
 	 type, 
@@ -1175,11 +1176,12 @@ handle_sync_get(Pid, UserId, TargetName, Oids, SendOpts, From, State) ->
 	    "~n   From:       ~p", 
 	    [Pid, UserId, TargetName, Oids, SendOpts, From]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_sync_get -> send a ~p message", [Vsn]),
 	    Extra   = ?GET_EXTRA(SendOpts), 
 	    ReqId   = send_get_request(Oids, Vsn, MsgData, 
-				       Addr, Port, Extra, State),
+				       Domain, Addr, Port, 
+				       Extra, State),
 	    ?vdebug("handle_sync_get -> ReqId: ~p", [ReqId]),
 	    Msg     = {sync_timeout, ReqId, From},
 	    Timeout = ?SYNC_GET_TIMEOUT(SendOpts), 
@@ -1190,6 +1192,7 @@ handle_sync_get(Pid, UserId, TargetName, Oids, SendOpts, From, State) ->
 			       user_id  = UserId, 
 			       reg_type = RegType, 
 			       target   = TargetName, 
+			       domain   = Domain, 
 			       addr     = Addr,
 			       port     = Port,
 			       type     = get, 
@@ -1227,11 +1230,12 @@ handle_sync_get_next(Pid, UserId, TargetName, Oids, SendOpts,
 	    "~n   From:       ~p", 
 	    [Pid, UserId, TargetName, Oids, SendOpts, From]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_sync_get_next -> send a ~p message", [Vsn]),
 	    Extra   = ?GET_EXTRA(SendOpts), 
 	    ReqId   = send_get_next_request(Oids, Vsn, MsgData, 
-					    Addr, Port, Extra, State),
+					    Domain, Addr, Port, 
+					    Extra, State),
 	    ?vdebug("handle_sync_get_next -> ReqId: ~p", [ReqId]),
 	    Msg     = {sync_timeout, ReqId, From},
 	    Timeout = ?SYNC_GET_NEXT_TIMEOUT(SendOpts), 
@@ -1242,6 +1246,7 @@ handle_sync_get_next(Pid, UserId, TargetName, Oids, SendOpts,
 			       user_id  = UserId, 
 			       reg_type = RegType, 
 			       target   = TargetName, 
+			       domain   = Domain, 
 			       addr     = Addr,
 			       port     = Port,
 			       type     = get_next, 
@@ -1285,10 +1290,11 @@ handle_sync_get_bulk(Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts,
 	    "~n   From:       ~p", 
 	    [Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts, From]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_sync_get_bulk -> send a ~p message", [Vsn]),
 	    Extra   = ?GET_EXTRA(SendOpts), 
-	    ReqId   = send_get_bulk_request(Oids, Vsn, MsgData, Addr, Port, 
+	    ReqId   = send_get_bulk_request(Oids, Vsn, MsgData, 
+					    Domain, Addr, Port, 
 					    NonRep, MaxRep, Extra, State),
 	    ?vdebug("handle_sync_get_bulk -> ReqId: ~p", [ReqId]),
 	    Msg     = {sync_timeout, ReqId, From},
@@ -1300,6 +1306,7 @@ handle_sync_get_bulk(Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts,
 			       user_id  = UserId, 
 			       reg_type = RegType, 
 			       target   = TargetName, 
+			       domain   = Domain, 
 			       addr     = Addr,
 			       port     = Port,
 			       type     = get_bulk, 
@@ -1339,11 +1346,12 @@ handle_sync_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, From, State) ->
 	    "~n   From:        ~p", 
 	    [Pid, UserId, TargetName, VarsAndVals, From]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_sync_set -> send a ~p message", [Vsn]),
 	    Extra   = ?GET_EXTRA(SendOpts), 
 	    ReqId   = send_set_request(VarsAndVals, Vsn, MsgData, 
-				       Addr, Port, Extra, State),
+				       Domain, Addr, Port, 
+				       Extra, State),
 	    ?vdebug("handle_sync_set -> ReqId: ~p", [ReqId]),
 	    Msg     = {sync_timeout, ReqId, From},
 	    Timeout = ?SYNC_SET_TIMEOUT(SendOpts), 
@@ -1354,6 +1362,7 @@ handle_sync_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, From, State) ->
 			       user_id  = UserId, 
 			       reg_type = RegType, 
 			       target   = TargetName, 
+			       domain   = Domain, 
 			       addr     = Addr,
 			       port     = Port,
 			       type     = set, 
@@ -1391,10 +1400,11 @@ handle_async_get(Pid, UserId, TargetName, Oids, SendOpts, State) ->
 	    "~n   SendOpts:   ~p",
 	    [Pid, UserId, TargetName, Oids, SendOpts]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_async_get -> send a ~p message", [Vsn]),
 	    Extra  = ?GET_EXTRA(SendOpts), 
-	    ReqId  = send_get_request(Oids, Vsn, MsgData, Addr, Port, 
+	    ReqId  = send_get_request(Oids, Vsn, MsgData, 
+				      Domain, Addr, Port, 
 				      Extra, State),
 	    ?vdebug("handle_async_get -> ReqId: ~p", [ReqId]),
 	    Expire = ?ASYNC_GET_TIMEOUT(SendOpts), 
@@ -1402,6 +1412,7 @@ handle_async_get(Pid, UserId, TargetName, Oids, SendOpts, State) ->
 			      user_id  = UserId, 
 			      reg_type = RegType, 
 			      target   = TargetName, 
+			      domain   = Domain, 
 			      addr     = Addr,
 			      port     = Port,
 			      type     = get, 
@@ -1439,17 +1450,19 @@ handle_async_get_next(Pid, UserId, TargetName, Oids, SendOpts, State) ->
 	    "~n   SendOpts:   ~p",
 	    [Pid, UserId, TargetName, Oids, SendOpts]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_async_get_next -> send a ~p message", [Vsn]),
 	    Extra  = ?GET_EXTRA(SendOpts), 
 	    ReqId  = send_get_next_request(Oids, Vsn, MsgData, 
-					   Addr, Port, Extra, State),
+					   Domain, Addr, Port, 
+					   Extra, State),
 	    ?vdebug("handle_async_get_next -> ReqId: ~p", [ReqId]),
 	    Expire = ?ASYNC_GET_NEXT_TIMEOUT(SendOpts), 
 	    Req    = #request{id       = ReqId,
 			      user_id  = UserId, 
 			      reg_type = RegType, 
 			      target   = TargetName, 
+			      domain   = Domain, 
 			      addr     = Addr,
 			      port     = Port,
 			      type     = get_next, 
@@ -1494,10 +1507,11 @@ handle_async_get_bulk(Pid,
 	    "~n   SendOpts:   ~p", 
 	    [Pid, UserId, TargetName, NonRep, MaxRep, Oids, SendOpts]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_async_get_bulk -> send a ~p message", [Vsn]),
 	    Extra  = ?GET_EXTRA(SendOpts), 
-	    ReqId  = send_get_bulk_request(Oids, Vsn, MsgData, Addr, Port, 
+	    ReqId  = send_get_bulk_request(Oids, Vsn, MsgData, 
+					   Domain, Addr, Port, 
 					   NonRep, MaxRep, Extra, State),
 	    ?vdebug("handle_async_get_bulk -> ReqId: ~p", [ReqId]),
 	    Expire = ?ASYNC_GET_BULK_TIMEOUT(SendOpts), 
@@ -1505,6 +1519,7 @@ handle_async_get_bulk(Pid,
 			      user_id  = UserId, 
 			      reg_type = RegType, 
 			      target   = TargetName, 
+			      domain   = Domain, 
 			      addr     = Addr,
 			      port     = Port,
 			      type     = get_bulk, 
@@ -1541,17 +1556,19 @@ handle_async_set(Pid, UserId, TargetName, VarsAndVals, SendOpts, State) ->
 	    "~n   SendOpts:    ~p",
 	    [Pid, UserId, TargetName, VarsAndVals, SendOpts]),
     case agent_data(TargetName, SendOpts) of
-	{ok, RegType, Addr, Port, Vsn, MsgData} ->
+	{ok, RegType, Domain, Addr, Port, Vsn, MsgData} ->
 	    ?vtrace("handle_async_set -> send a ~p message", [Vsn]),
 	    Extra  = ?GET_EXTRA(SendOpts), 
 	    ReqId  = send_set_request(VarsAndVals, Vsn, MsgData, 
-				      Addr, Port, Extra, State),
+				      Domain, Addr, Port, 
+				      Extra, State),
 	    ?vdebug("handle_async_set -> ReqId: ~p", [ReqId]),
 	    Expire = ?ASYNC_SET_TIMEOUT(SendOpts), 
 	    Req    = #request{id       = ReqId,
 			      user_id  = UserId, 
 			      reg_type = RegType, 
 			      target   = TargetName, 
+			      domain   = Domain, 
 			      addr     = Addr,
 			      port     = Port,
 			      type     = set, 
@@ -2907,7 +2924,7 @@ do_gc(Key, Now) ->
 %% 
 %%----------------------------------------------------------------------
 
-send_get_request(Oids, Vsn, MsgData, Addr, Port, ExtraInfo, 
+send_get_request(Oids, Vsn, MsgData, Domain, Addr, Port, ExtraInfo, 
 		 #state{net_if     = NetIf, 
 			net_if_mod = Mod,
 			mini_mib   = MiniMIB}) ->
@@ -2918,34 +2935,39 @@ send_get_request(Oids, Vsn, MsgData, Addr, Port, ExtraInfo,
 	    "~n   Pdu:     ~p"
 	    "~n   Vsn:     ~p"
 	    "~n   MsgData: ~p"
+	    "~n   Domain:  ~p"
 	    "~n   Addr:    ~p"
-	    "~n   Port:    ~p", [Mod, NetIf, Pdu, Vsn, MsgData, Addr, Port]),
-    (catch Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo)),
+	    "~n   Port:    ~p", 
+	    [Mod, NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port]),
+    Res = (catch Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, 
+			      Domain, Addr, Port, ExtraInfo)),
+    ?vtrace("send_get_request -> send result:"
+	    "~n   ~p", [Res]),
     Pdu#pdu.request_id.
 
-send_get_next_request(Oids, Vsn, MsgData, Addr, Port, ExtraInfo, 
+send_get_next_request(Oids, Vsn, MsgData, Domain, Addr, Port, ExtraInfo, 
 		      #state{mini_mib   = MiniMIB, 
 			     net_if     = NetIf, 
 			     net_if_mod = Mod}) ->
     Pdu = make_pdu(get_next, Oids, MiniMIB),
-    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo),
+    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo),
     Pdu#pdu.request_id.
 
-send_get_bulk_request(Oids, Vsn, MsgData, Addr, Port, 
+send_get_bulk_request(Oids, Vsn, MsgData, Domain, Addr, Port, 
 		      NonRep, MaxRep, ExtraInfo, 
 		      #state{mini_mib   = MiniMIB, 
 			     net_if     = NetIf, 
 			     net_if_mod = Mod}) ->
     Pdu = make_pdu(bulk, {NonRep, MaxRep, Oids}, MiniMIB),
-    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo),
+    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo),
     Pdu#pdu.request_id.
 
-send_set_request(VarsAndVals, Vsn, MsgData, Addr, Port, ExtraInfo, 
+send_set_request(VarsAndVals, Vsn, MsgData, Domain, Addr, Port, ExtraInfo, 
 		 #state{mini_mib   = MiniMIB,
 			net_if     = NetIf, 
 			net_if_mod = Mod}) ->
     Pdu = make_pdu(set, VarsAndVals, MiniMIB),
-    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo),
+    Mod:send_pdu(NetIf, Pdu, Vsn, MsgData, Domain, Addr, Port, ExtraInfo),
     Pdu#pdu.request_id.
 
 %% send_discovery(Vsn, MsgData, Addr, Port, ExtraInfo, 
@@ -3181,10 +3203,11 @@ agent_data(TargetName, SendOpts) ->
 			
 			{Comm, SecModel}
 		end,
+	    Domain  = agent_data_item(tdomain,  Info),
 	    Addr    = agent_data_item(address,  Info),
 	    Port    = agent_data_item(port,     Info),
 	    RegType = agent_data_item(reg_type, Info),
-	    {ok, RegType, Addr, Port, version(Version), MsgData};
+	    {ok, RegType, Domain, Addr, Port, version(Version), MsgData};
 	Error ->
 	    Error
     end.
diff --git a/lib/snmp/src/misc/snmp_conf.erl b/lib/snmp/src/misc/snmp_conf.erl
index 20f4455d10..7249def24e 100644
--- a/lib/snmp/src/misc/snmp_conf.erl
+++ b/lib/snmp/src/misc/snmp_conf.erl
@@ -37,7 +37,9 @@
 
 	 check_timer/1,
 
+	 all_domains/0, 
 	 check_domain/1, 
+	 all_tdomains/0, 
 	 check_tdomain/1,  
 	 mk_tdomain/1, 
 	 which_domain/1, 
@@ -345,6 +347,25 @@ check_sec_level(BadSecLevel) ->
 
 
 %% ---------
+all_tdomains() ->
+    [
+     ?transportDomainUdpIpv4, 
+     ?transportDomainUdpIpv6, 
+     ?transportDomainUdpIpv4z, 
+     ?transportDomainUdpIpv6z, 
+     ?transportDomainTcpIpv4, 
+     ?transportDomainTcpIpv6, 
+     ?transportDomainTcpIpv4z, 
+     ?transportDomainTcpIpv6z, 
+     ?transportDomainSctpIpv4, 
+     ?transportDomainSctpIpv6, 
+     ?transportDomainSctpIpv4z, 
+     ?transportDomainSctpIpv6z, 
+     ?transportDomainLocal, 
+     ?transportDomainUdpDns, 
+     ?transportDomainTcpDns,
+     ?transportDomainSctpDns
+    ].
 
 check_tdomain(TDomain) ->
     SupportedTDomains = 
@@ -353,25 +374,7 @@ check_tdomain(TDomain) ->
 	 ?transportDomainUdpIpv4,
 	 ?transportDomainUdpIpv6			 
 	],
-    AllTDomains = 
-	[
-	 ?transportDomainUdpIpv4, 
-	 ?transportDomainUdpIpv6, 
-	 ?transportDomainUdpIpv4z, 
-	 ?transportDomainUdpIpv6z, 
-	 ?transportDomainTcpIpv4, 
-	 ?transportDomainTcpIpv6, 
-	 ?transportDomainTcpIpv4z, 
-	 ?transportDomainTcpIpv6z, 
-	 ?transportDomainSctpIpv4, 
-	 ?transportDomainSctpIpv6, 
-	 ?transportDomainSctpIpv4z, 
-	 ?transportDomainSctpIpv6z, 
-	 ?transportDomainLocal, 
-	 ?transportDomainUdpDns, 
-	 ?transportDomainTcpDns,
-	 ?transportDomainSctpDns
-	],
+    AllTDomains = all_tdomains(), 
     case lists:member(TDomain, SupportedTDomains) of
 	true ->
 	    ok;
@@ -388,7 +391,7 @@ check_tdomain(TDomain) ->
 %% ---------
 
 mk_tdomain(snmpUDPDomain) ->
-    ?snmpUDPDomain;
+    mk_tdomain(transportDomainUdpIpv4);
 mk_tdomain(transportDomainUdpIpv4) ->
     ?transportDomainUdpIpv4;
 mk_tdomain(transportDomainUdpIpv6) ->
@@ -474,6 +477,26 @@ do_check_timer(WaitFor, Factor, Incr, Retry) ->
 
 %% ---------
 
+all_domains() ->
+    [
+     transportDomainUdpIpv4, 
+     transportDomainUdpIpv6, 
+     transportDomainUdpIpv4z, 
+     transportDomainUdpIpv6z, 
+     transportDomainTcpIpv4, 
+     transportDomainTcpIpv6, 
+     transportDomainTcpIpv4z, 
+     transportDomainTcpIpv6z, 
+     transportDomainSctpIpv4, 
+     transportDomainSctpIpv6, 
+     transportDomainSctpIpv4z, 
+     transportDomainSctpIpv6z, 
+     transportDomainLocal, 
+     transportDomainUdpDns, 
+     transportDomainTcpDns,
+     transportDomainSctpDns
+    ].
+
 check_domain(Domain) ->
     SupportedDomains = 
 	[
@@ -481,25 +504,7 @@ check_domain(Domain) ->
 	 transportDomainUdpIpv4,
 	 transportDomainUdpIpv6
 	],
-    AllDomains = 
-	[
-	 transportDomainUdpIpv4, 
-	 transportDomainUdpIpv6, 
-	 transportDomainUdpIpv4z, 
-	 transportDomainUdpIpv6z, 
-	 transportDomainTcpIpv4, 
-	 transportDomainTcpIpv6, 
-	 transportDomainTcpIpv4z, 
-	 transportDomainTcpIpv6z, 
-	 transportDomainSctpIpv4, 
-	 transportDomainSctpIpv6, 
-	 transportDomainSctpIpv4z, 
-	 transportDomainSctpIpv6z, 
-	 transportDomainLocal, 
-	 transportDomainUdpDns, 
-	 transportDomainTcpDns,
-	 transportDomainSctpDns
-	],
+    AllDomains = all_domains(), 
     case lists:member(Domain, SupportedDomains) of
 	true ->
 	    ok;
diff --git a/lib/snmp/src/misc/snmp_config.erl b/lib/snmp/src/misc/snmp_config.erl
index fcbc6a88c9..27bef216cc 100644
--- a/lib/snmp/src/misc/snmp_config.erl
+++ b/lib/snmp/src/misc/snmp_config.erl
@@ -568,7 +568,7 @@ config_agent_snmp(Dir, Vsns) ->
 	       false ->
 		   ok
 	   end,
-	   i("The following agent files were written: agent.conf, "
+	   i("The following agent files where written: agent.conf, "
 	     "community.conf,~n"
 	     "standard.conf, target_addr.conf, "
 	     "target_params.conf, ~n"
@@ -776,7 +776,7 @@ config_manager_snmp(Dir, Vsns) ->
 					 Users, Agents, Usms)) of
 	ok ->
 	   i("~n- - - - - - - - - - - - -"),
-	   i("The following manager files were written: "
+	   i("The following manager files where written: "
 	     "manager.conf, agents.conf " ++ 
 	     case lists:member(v3, Vsns) of
 		 true ->
diff --git a/lib/snmp/test/snmp_manager_test.erl b/lib/snmp/test/snmp_manager_test.erl
index 0b536748fb..d18f20d359 100644
--- a/lib/snmp/test/snmp_manager_test.erl
+++ b/lib/snmp/test/snmp_manager_test.erl
@@ -61,6 +61,7 @@
 	
 	 register_agent1/1,
 	 register_agent2/1,
+	 register_agent3/1,
 
 	 info/1,
 	 
@@ -383,12 +384,12 @@ end_per_testcase2(Case, Config) ->
 all() -> 
     [
      {group, start_and_stop_tests}, 
-     {group, misc_tests},
+     {group, misc_tests}, 
      {group, user_tests}, 
-     {group, agent_tests},
+     {group, agent_tests}, 
      {group, request_tests}, 
      {group, event_tests}, 
-     discovery,
+     discovery, 
      {group, tickets}
     ].
 
@@ -417,7 +418,8 @@ groups() ->
      {agent_tests, [], 
       [
        register_agent1, 
-       register_agent2
+       register_agent2, 
+       register_agent3
       ]
      },
      {request_tests, [],
@@ -477,14 +479,14 @@ groups() ->
       },
       {event_tests, [],
        [
-	trap1, 
-        trap2, 
-        inform1, 
-        inform2, 
-        inform3, 
-        inform4,
-        inform_swarm, 
-        report
+	trap1%% , 
+        %% trap2, 
+        %% inform1, 
+        %% inform2, 
+        %% inform3, 
+        %% inform4,
+        %% inform_swarm, 
+        %% report
        ]
       },
      {tickets, [], 
@@ -1134,6 +1136,7 @@ register_agent1(suite) ->
 register_agent1(Config) when is_list(Config) ->
     process_flag(trap_exit, true),
     put(tname,ra1),
+    
     p("starting with Config: ~p~n", [Config]),
 
     ManagerNode = start_manager_node(), 
@@ -1164,7 +1167,7 @@ register_agent1(Config) when is_list(Config) ->
 
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
 
-    p("register user(s) calvin & hobbe"),
+    p("register user(s) user_alfa & user_beta"),
     ?line ok = mgr_register_user(ManagerNode, user_alfa, snmpm_user_default, []),
     ?line ok = mgr_register_user(ManagerNode, user_beta, snmpm_user_default, []),
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
@@ -1293,7 +1296,7 @@ register_agent2(Config) when is_list(Config) ->
 
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
 
-    p("register user(s) calvin & hobbe"),
+    p("register user(s) user_alfa & user_beta"),
     ?line ok = mgr_register_user(ManagerNode, user_alfa, snmpm_user_default, []),
     ?line ok = mgr_register_user(ManagerNode, user_beta, snmpm_user_default, []),
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
@@ -1348,7 +1351,7 @@ register_agent2(Config) when is_list(Config) ->
     end,
 
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
-    
+
     p("unregister user user_alfa"),
     ?line ok = mgr_unregister_user(ManagerNode, user_alfa),
 
@@ -1377,7 +1380,157 @@ register_agent2(Config) when is_list(Config) ->
 
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
 
-    p("unregister user hobbe"),
+    p("unregister user user_beta"),
+    ?line ok = mgr_unregister_user(ManagerNode, user_beta),
+
+    p("manager info: ~p~n", [mgr_info(ManagerNode)]),
+
+    ?SLEEP(1000),
+
+    p("stop snmp application (with only manager)"),
+    ?line ok = stop_snmp(ManagerNode),
+
+    ?SLEEP(1000),
+
+    stop_node(ManagerNode),
+
+    ?SLEEP(1000),
+
+    p("end"),
+    ok.
+
+
+%%======================================================================
+
+register_agent3(doc) -> 
+    ["Test registration of agents with the NEW interface functions "
+     "and specifying transport domain"];
+register_agent3(suite) -> 
+    [];
+register_agent3(Config) when is_list(Config) ->
+    process_flag(trap_exit, true),
+    put(tname, ra3),
+    p("starting with Config: ~p~n", [Config]),
+
+    ManagerNode = start_manager_node(), 
+
+    ConfDir = ?config(manager_conf_dir, Config),
+    DbDir   = ?config(manager_db_dir, Config),
+    LocalHost = snmp_test_lib:localhost(), 
+
+
+    write_manager_conf(ConfDir),
+
+    Opts = [{server,     [{verbosity, trace}]},
+	    {net_if,     [{verbosity, trace}]},
+	    {note_store, [{verbosity, trace}]},
+	    {config, [{verbosity, trace}, {dir, ConfDir}, {db_dir, DbDir}]}],
+
+
+    p("load snmp application"),
+    ?line ok = load_snmp(ManagerNode),
+
+    p("set manager env for the snmp application"),
+    ?line ok = set_mgr_env(ManagerNode, Opts),
+
+    p("starting snmp application (with only manager)"),
+    ?line ok = start_snmp(ManagerNode),
+
+    p("started"),
+
+    ?SLEEP(1000),
+
+    p("manager info: ~p~n", [mgr_info(ManagerNode)]),
+
+    p("register user(s) user_alfa & user_beta"),
+    ?line ok = mgr_register_user(ManagerNode, user_alfa, snmpm_user_default, []),
+    ?line ok = mgr_register_user(ManagerNode, user_beta, snmpm_user_default, []),
+    p("manager info: ~p~n", [mgr_info(ManagerNode)]),
+
+    p("register agent(s)"),
+    TargetName1 = "agent2", 
+    ?line ok = mgr_register_agent(ManagerNode, user_alfa, TargetName1, 
+				  [{tdomain,   transportDomainUdpIpv4},
+				   {address,   LocalHost},
+				   {port,      5001},
+				   {engine_id, "agentEngineId-1"}]),
+    TargetName2 = "agent3", 
+    ?line ok = mgr_register_agent(ManagerNode, user_alfa, TargetName2,
+				  [{tdomain,   transportDomainUdpIpv6},
+				   {address,   LocalHost},
+				   {port,      5002},
+				   {engine_id, "agentEngineId-2"}]),
+    TargetName3 = "agent4", 
+    ?line {error, {unsupported_domain, _} = Reason4} = 
+	mgr_register_agent(ManagerNode, user_beta, TargetName3,
+			   [{tdomain,   transportDomainTcpIpv4},
+			    {address,   LocalHost},
+			    {port,      5003},
+			    {engine_id, "agentEngineId-3"}]),
+    p("Expected registration failure: ~p", [Reason4]),
+    TargetName4 = "agent5", 
+    ?line {error, {unknown_domain, _} = Reason5} = 
+	mgr_register_agent(ManagerNode, user_beta, TargetName4,
+			   [{tdomain,   transportDomainUdpIpv4_bad},
+			    {address,   LocalHost},
+			    {port,      5004},
+			    {engine_id, "agentEngineId-4"}]),
+    p("Expected registration failure: ~p", [Reason5]),
+
+    p("verify all agent(s): expect 2"),
+    case mgr_which_agents(ManagerNode) of
+	Agents1 when length(Agents1) =:= 2 ->
+	    p("all agents: ~p~n", [Agents1]),
+	    ok;
+	Agents1 ->
+	    ?FAIL({agent_registration_failure, Agents1})
+    end,
+
+    p("verify user_alfa agent(s)"),
+    case mgr_which_agents(ManagerNode, user_alfa) of
+	Agents2 when length(Agents2) =:= 2 ->
+	    p("calvin agents: ~p~n", [Agents2]),
+	    ok;
+	Agents2 ->
+	    ?FAIL({agent_registration_failure, Agents2})
+    end,
+
+    p("verify user_beta agent(s)"),
+    case mgr_which_agents(ManagerNode, user_beta) of
+	Agents3 when length(Agents3) =:= 0 ->
+	    p("hobbe agents: ~p~n", [Agents3]),
+	    ok;
+	Agents3 ->
+	    ?FAIL({agent_registration_failure, Agents3})
+    end,
+
+    p("manager info: ~p~n", [mgr_info(ManagerNode)]),
+
+    p("unregister user user_alfa"),
+    ?line ok = mgr_unregister_user(ManagerNode, user_alfa),
+
+    p("verify all agent(s): expect 0"),
+    case mgr_which_agents(ManagerNode) of
+	Agents4 when length(Agents4) =:= 0 ->
+	    p("all agents: ~p~n", [Agents4]),
+	    ok;
+	Agents4 ->
+	    ?FAIL({agent_unregistration_failure, Agents4})
+    end,
+    p("manager info: ~p~n", [mgr_info(ManagerNode)]),
+
+    p("verify all agent(s): expect 0"),
+    case mgr_which_agents(ManagerNode) of
+	[] ->
+	    ok;
+	Agents5 ->
+	    p("all agents: ~p~n", [Agents5]),
+	    ?FAIL({agent_unregistration_failure, Agents5})
+    end,
+
+    p("manager info: ~p~n", [mgr_info(ManagerNode)]),
+
+    p("unregister user user_beta"),
     ?line ok = mgr_unregister_user(ManagerNode, user_beta),
 
     p("manager info: ~p~n", [mgr_info(ManagerNode)]),
diff --git a/lib/snmp/vsn.mk b/lib/snmp/vsn.mk
index fe3ba2c04a..08251ab9ea 100644
--- a/lib/snmp/vsn.mk
+++ b/lib/snmp/vsn.mk
@@ -17,6 +17,6 @@
 #
 # %CopyrightEnd%
 
-SNMP_VSN = 4.20.1
+SNMP_VSN = 4.21
 PRE_VSN  =
 APP_VSN  = "snmp-$(SNMP_VSN)$(PRE_VSN)"