Mailing List Archive: Help: SNMP Trap problem

Hello All,

I have M20. When my M20 (172.21.11.1) sends trap message to SNMP server, I get like this

13:24:41.578440 Out IP 172.21.11.1.3235 > 10.21.120.131.snmptrap: Trap(35) E:2636.1.1.1.2.2 172.21.11.1 linkDown 949639883 [|snmp]

13:24:41.578489 Out IP 172.21.11.1.3235 > 10.21.120.132.snmptrap: Trap(35) E:2636.1.1.1.2.2 172.21.11.1 linkDown 949639883 [|snmp]

13:24:41.578535 Out IP 172.21.11.1.3235 > 172.21.4.10.snmptrap: Trap(35) E:2636.1.1.1.2.2 172.21.11.1 linkDown 949639883 [|snmp]

13:24:41.578589 Out IP 172.21.11.1.3235 > 10.21.120.131.snmptrap: V2Trap(33) system.sysUpTime.0=949639883 =[|snmp]

13:24:41.578639 Out IP 172.21.11.1.3235 > 10.21.120.132.snmptrap: V2Trap(33) system.sysUpTime.0=949639883 =[|snmp]

13:24:41.578689 Out IP 172.21.11.1.3235 > 172.21.4.10.snmptrap: V2Trap(33) system.sysUpTime.0=949639883 =[|snmp]

13:24:41.579170 In IP 10.21.120.131 > 172.21.11.1: icmp: 10.21.120.131 udp port snmptrap unreachable (DF)

13:24:41.579529 In IP 10.21.120.132 > 172.21.11.1: icmp: 10.21.120.132 udp port snmptrap unreachable (DF)

13:24:41.579646 In IP 10.21.120.131 > 172.21.11.1: icmp: 10.21.120.131 udp port snmptrap unreachable (DF)

13:24:41.579767 In IP 10.21.120.132 > 172.21.11.1: icmp: 10.21.120.132 udp port snmptrap unreachable (DF)

Can you give me some lights why machines 10.21.120.132 and 131 are replying back like above ?.

172.21.4.10 Machine accepts the traps.

Best Regards

Yuki

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>13:24:41.579170 In IP 10.21.120.131 > 172.21.11.1: icmp: 10.21.120.131 udp port snmptrap unreachable (DF)
>13:24:41.579529 In IP 10.21.120.132 > 172.21.11.1: icmp: 10.21.120.132 udp port snmptrap unreachable (DF)
>13:24:41.579646 In IP 10.21.120.131 > 172.21.11.1: icmp: 10.21.120.131 udp port snmptrap unreachable (DF)
>13:24:41.579767 In IP 10.21.120.132 > 172.21.11.1: icmp: 10.21.120.132 udp port snmptrap unreachable (DF)

>Can you give me some lights why machines 10.21.120.132 and 131 are replying back like above ?.
>172.21.4.10 Machine accepts the traps.

It looks like both machines (10.21.120.131 and 10.21.120.132) don't have snmptrap deamon
working. As You can see both server answer with "icmp: udp port snmptrap unreachable" - it
means that they don't have any process listening on this port. There are two widely used
ports for SNMP:
1) UDP port 161 - for SNMP queries (snmpget,snmpset etc.)
2) UDP port 162 - for SNMP traps - this deamon accepts SNMP traps - in case of these
machines this deamon is not working.

Regards,
Tomasz