Trap source address

I have a linux host with multiple interfaces. Using net-snmp-5.2.3 (have
tried 3 versions so far) how can I set the source IP of sent traps. 

I have tried the "clientaddr" config setting but this doesn't work.

I have tried modifying "snmplib/snmp_api.c" by changing 

"netsnmp_ds_register_config(ASN_OCTET_STR, "snmp", "clientaddr","

to

"netsnmp_ds_register_premib(ASN_OCTET_STR, "snmp", "clientaddr","

but still no joy.

Here is a packet dump of a cold_start trap being sent. (IP addresses
changed). As you can see, the packet comes from "221.42.21.3" which is
correct but the address in the snmp "bit" is set to "192.168.0.1". This
is an interface on the host but not the one I want.

16:49:37.742119 IP 221.42.21.3.32774 > 221.206.33.145.snmptrap:
Trap(28)  E:8072.4 192.168.0.1 enterpriseSpecific s=2 18180
        0x0000:  45a0 0047 0001 4000 3c11 4c78 dd2a 1503
E..G..@.<.Lx.*..
        0x0010:  ddce 2191 8006 00a2 0033 6444 3029
0201  ..!......3dD0)..
        0x0020:  0004 0670 7562 6c69 63a4 1c06 082b
0601  ...public....+..
        0x0030:  0401 bf08 0440 04c0 a800 0102 0106
0201  .....@..........
        0x0040:  0243 0247 0430 00                        .C.G.0.
16:49:37.900034 IP 221.42.21.3.32774 > 221.206.33.145.snmptrap:
Trap(29)  E:8072.3.2.10 192.168.0.1 coldStart 5
        0x0000:  45a0 0048 0000 4000 3c11 4c78 dd2a 1503
E..H..@.<.Lx.*..
        0x0010:  ddce 2191 8006 00a2 0034 2fb7 302a
0201  ..!......4/.0*..
        0x0020:  0004 0670 7562 6c69 63a4 1d06 0a2b
0601  ...public....+..
        0x0030:  0401 bf08 0302 0a40 04c0 a800 0102
0100  .......@........
        0x0040:  0201 0043 0105 3000                      ...C..0.


Regards

Dan.

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