Thanks for the information. I now poll ifOperStatus and that does detect
a LAN interface change from Up to Down when a LAN cable is removed.

Mark

Mike Ayers wrote:
>> From: net-snmp-users-bounces@lists.sourceforge.net
>> [mailto:net-snmp-users-bounces@lists.sourceforge.net] On
>> Behalf Of Mark Harper
>> Sent: Tuesday, July 17, 2007 5:51 AM
>>

>
>
>> We have a problem where we have a machine on 2 LANS and want
>> to monitor
>> when a LAN goes down via SNMP Get polling.
>>

>
> Monitor ifOperStatus for the interfaces. You can read alternately from both interfaces. If everything times out, you know both interfaces are down.
>
>
>> The machine has two LAN connections and two IP addresses,
>>
>> 10.49.254.1
>> 10.49.255.1
>>
>> When one of the LAN connections (10.49.254.1) is broken by
>> removing the
>> LAN cable from the machine,
>>
>> ping 10.49.254.1
>>
>> times out and fails thus detecting the LAN failure.
>>
>> However,
>>
>> snmpget -v2c -c cctv 10.49.254.1 1.3.6.1.2.1.1.6.0
>>
>> succeeds thus giving no indication of the fault we were
>> trying to detect.
>>
>> Why does this occur and is there a solution to make snmpget
>> detect the
>> failure successfully?
>>

>
> I would not expect this to work as you intend. The reason is left as an exercise for the student. Hint: only ping should be used for pinging.
>
>
> HTH,
>
> Mike
>



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