Wrong reading given by nagios

[Andreas Ericsson]

vivek sharma sharma wrote:
> Dear all, I am using Nagios nagios to monitor uptime of few routers
> and switches etc. I am getting two false readings from Nagios.


> 1.) Sometimes it says as time to live exceeded When i have configured 95%
> and 700ms in critical state of check_ping.

I assume you're using the check_icmp plugin for this.

Time to live exceeded is what you get if
1) there are routing problems, causing packets to loop indefinitely 
between two nodes or two interfaces on the same node. The ttl value was 
introduced specifically to prevent this.
2) you have redundant routes to a host, and the "usual" route goes down 
while the secondary one is more than whatever default TTL is set on 
outgoing packets. You can try increasing the ttl value on outgoing 
packets using the -l flag to check_icmp. The maximum value is 255.

> 2.) Secondly I am not getting any notification mails from the monitor.
> 

This is a configuration issue. It is impossible to give detailed help 
without detailed error info.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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