> 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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