RE: Ping detects LAN failure but snmpget Doesn't detect LAN failure

> From: [email protected] 
> [mailto:[email protected]] 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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