False positive? (CRITICAL - Time to live exceeded)

Andreas Ericsson ae at op5.se
Fri Oct 28 15:26:11 CEST 2005


Jason Byrns wrote:
> Good morning, everyone!
> 
> We've been using Nagios for awhile, and I'm migrating to a newer server. 
>  The new server is showing a false positive for just one host.  Anyone 
> have suggestions on solving this problem?
> 
> The Nagios web interface shows this single host with a critical alert: 
> "Time to live exceeded (ip.add.re.ss)"  It's being checked with a 
> "check-host-alive" command, which is defined as:
> 

You can try check_icmp instead. It will tell you why the ttl count was 
exceeded (it can be done either in transmit or in packet re-assembly).

> $USER1$/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100%
> 
> This works just fine

Define "fine". Does it print exactly one line of output? Does it exit 
with the expected exit-code?

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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