My configuration and invocation is similar. To simplify things I did some testing using your exact examples and found that the same problem happened. I sent the trap using your syntax and port: snmptrap -v 2c -c trappy "udp6:[fd22:2222:2222:3490:be5f:f4ff:fee1:a1ef]:2000" 42 linkUp; Because of the -d arg passed to snmptrapd I see the packet coming in, but it is not accepted. /tmp>sudo snmptrapd -d -Le -f -c ~/snmptrapd.conf udp:2000 udp6:2000 NET-SNMP version 5.7.2.1 Received 69 byte packet from UDP/IPv6: [fd22:2222:2222:3490::1]:57327 0000: 30 43 02 01 01 04 06 74 72 61 70 70 79 A7 36 02 0C.....trappy.6. 0016: 04 0E 96 8D 3D 02 01 00 02 01 00 30 28 30 0D 06 ....=......0(0.. 0032: 08 2B 06 01 02 01 01 03 00 43 01 2A 30 17 06 0A .+.......C.*0... 0048: 2B 06 01 06 03 01 01 04 01 00 06 09 2B 06 01 06 +...........+... 0064: 03 01 01 05 04 ..... ^C2014-05-08 16:13:09 NET-SNMP version 5.7.2.1 Stopped. Stopping snmptrapd I used the same conf file as you did: /tmp>cat ~/snmptrapd.conf authCommunity log trappy /tmp> This is on 64 bit Xubuntu. Here's the 'uname -a' output: Linux cwu-dev2 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux I decided to try sending traps to a completely different PC that I put on the same network. I used a PC running the 64 bit version of Windows 7. To my surprise it worked. I couldn't test with version 5.7.2.1 because Windows binaries for that version aren't available yet. C:\ar>snmptrapd -d -Le -f -c snmptrapd.conf udp:2000 udp6:2000 NET-SNMP version 5.5
Received 69 bytes from UDP/IPv6: [fd22:2222:2222:3490::1]:59337 0000: 30 43 02 01 01 04 06 74 72 61 70 70 79 A7 36 02 0C.....trappy§6. 0016: 04 40 E0 C1 B2 02 01 00 02 01 00 30 28 30 0D 06 .@àA²......0(0.. 0032: 08 2B 06 01 02 01 01 03 00 43 01 2A 30 17 06 0A .+.......C.*0... 0048: 2B 06 01 06 03 01 01 04 01 00 06 09 2B 06 01 06 +.......... +... 0064: 03 01 01 05 04 ..... 2014-05-08 18:38:14 UDP/IPv6: [fd22:2222:2222:3490::1]:59337 [UDP/IPv6: [fd22:2222:2222:3490::1]:59337]: DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (42) 0:00:00.42 SNMPv2-MIB::snmpTrapOID.0 = OID: IF-MIB::linkUp ^C C:\ar> ---- On Thu, 08 May 2014 07:37:35 -0700 Bill Fenner wrote ---- >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 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 .+........ > > > ------------------------------------------------------------------------------ > > "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE > Instantly run your Selenium tests across 300+ browser/OS combos. 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