Re: Cannot receive v2 traps/informs sent via IPv6

Can you say more about your configuration and invocation?

Using net-snmp 5.7.2, I ran:

snmptrapd -Le -f -c ~/snmptrapd.conf udp:2000 udp6:2000

with just this line in ~/snmptrapd.conf

authCommunity log trappy

and then sent a trap with:

snmptrap -v 2c -c trappy
"udp6:[fd7a:629f:52a4:2010:225:90ff:fea8:86a2]:2000" 42 linkUp

and got:

2014-05-08 07:34:17 UDP/IPv6:
[fd7a:629f:52a4:2010:225:90ff:fea8:86a2]:50583 [UDP/IPv6:
[fd7a:629f:52a4:2010:225:90ff:fea8:86a2]:50583]:
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (42) 0:00:00.42
 SNMPv2-MIB::snmpTrapOID.0 = OID: IF-MIB::linkUp

  Bill


On Thu, May 1, 2014 at 2:00 PM, christopher.wu <[email protected]>wrote:

> I'm having a strange problem where my snmptrapd server will not accept v2
> traps/informs if they are sent via ipv6.  My snmptrapd server is version
> 5.7.2.1 running on Linux.  The traps/informs are being sent by version
> 5.5.1 of snmptrap, also on Linux.  I tried version 5.7.2.1 of snmptrap but
> that did not work either.
>
> Here are the scenarios:
>
> 1) v3 inform sent via ipv4 - works
> 1) v3 inform sent via ipv6 - works
> 2) change to v2 and send to same ipv6 address - fails.  Because I'm
> running snmptrapd with the '-d' arg I do see the packet come in, but it is
> not accepted.  In the packet dump I can see the correct v2 community name
> is being used.  Of course I switched to a different, appropriate v2 config
> file for snmptrapd when I switched from sending v3 to v2 traps.
> 3) keep the same v2 credentials and send via ipv4 - works
>
> I couldn't find anything in the bug database that mentions this.  Are
> there any debugging steps that I can do to help figure out what is
> happening?
>
> Here's an example of ipv4 working but ipv6 not when v2 is used.
>
>
> Received 75 byte packet from UDP:
> [192.168.108.1]:55953->[192.168.108.2]:162
> 0000: 30 49 02 01  01 04 0A 4E  4F 54 57 4F  52 4B 49 4E
>  0I.....NOTWORKIN
> 0016: 47 A6 38 02  04 1E 48 83  BD 02 01 00  02 01 00 30
>  G.8...H........0
> 0032: 2A 30 0F 06  08 2B 06 01  02 01 01 03  00 43 03 67
>  *0...+.......C.g
> 0048: 66 B4 30 17  06 0A 2B 06  01 06 03 01  01 04 01 00
>  f.0...+.........
> 0064: 06 09 2B 06  01 06 03 01  01 05 01                    ..+........
>
> 2014-05-01 13:47:02 UDP: [192.168.108.1]:55953->[192.168.108.2]:162 [UDP:
> [192.168.108.1]:55953->[192.168.108.2]:162]:
> DISMAN-EXPRESSION-MIB::sysUpTimeInstance = Timeticks: (6776500)
> 18:49:25.00     SNMPv2-MIB::snmpTrapOID.0 = OID: SNMPv2-MIB::coldStart
>
> Sending 75 bytes to UDP: [192.168.108.1]:55953->[192.168.108.2]:162
> 0000: 30 49 02 01  01 04 0A 4E  4F 54 57 4F  52 4B 49 4E
>  0I.....NOTWORKIN
> 0016: 47 A2 38 02  04 1E 48 83  BD 02 01 00  02 01 00 30
>  G.8...H........0
> 0032: 2A 30 0F 06  08 2B 06 01  02 01 01 03  00 43 03 67
>  *0...+.......C.g
> 0048: 66 B4 30 17  06 0A 2B 06  01 06 03 01  01 04 01 00
>  f.0...+.........
> 0064: 06 09 2B 06  01 06 03 01  01 05 01                    ..+........
>
>
> Received 74 byte packet from UDP/IPv6: [fd22:2222:2222:3490::1]:33344
> 0000: 30 48 02 01  01 04 0A 4E  4F 54 57 4F  52 4B 49 4E
>  0H.....NOTWORKIN
> 0016: 47 A6 37 02  03 68 5B 7F  02 01 00 02  01 00 30 2A
>  G.7..h[.......0*
> 0032: 30 0F 06 08  2B 06 01 02  01 01 03 00  43 03 67 66
>  0...+.......C.gf
> 0048: B4 30 17 06  0A 2B 06 01  06 03 01 01  04 01 00 06
>  .0...+..........
> 0064: 09 2B 06 01  06 03 01 01  05 01                       .+........
>
>
> Received 74 byte packet from UDP/IPv6: [fd22:2222:2222:3490::1]:33344
> 0000: 30 48 02 01  01 04 0A 4E  4F 54 57 4F  52 4B 49 4E
>  0H.....NOTWORKIN
> 0016: 47 A6 37 02  03 68 5B 7F  02 01 00 02  01 00 30 2A
>  G.7..h[.......0*
> 0032: 30 0F 06 08  2B 06 01 02  01 01 03 00  43 03 67 66
>  0...+.......C.gf
> 0048: B4 30 17 06  0A 2B 06 01  06 03 01 01  04 01 00 06
>  .0...+..........
> 0064: 09 2B 06 01  06 03 01 01  05 01                       .+........
>
>
>
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