[j-nsp] Help: SNMP Trap problem

[Tomasz Dabrowski (WA/EPO)]

>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