[j-nsp] Help: SNMP Trap problem

[David Martinez CSIC RedIRIS]

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El Jueves, 30 de Octubre de 2003 03:27, Yuki Arif (JA/EID) escribió:
> 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.

	The problem is that the machine is really not accepting the connections.

	In UDP, when the port you're trying is not open, an ICMP message is sent back 
to the source with type "Port Unreachable". That's why the machine replies 
with ICMP packets.

	Sorry for the delay. O:-) Hope that this helps you.


		Ender.
- -- 
 Why is a cow? Mu. (Ommmmmmmmmm)
- --
Servicios de red - Network services
Centro de Comunicaciones CSIC/RedIRIS
Spanish Academic Network for Research and Development
Madrid (Spain)
Tlf (+34) 91.585.49.05
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