[Nagiosplug-devel] check_icmp & TTL expired in transit behaviour

Jelle Smet nagios at smetj.net
Tue Mar 1 22:27:53 CET 2011

 Hi list,

 I'm using check_icmp (http://nagiosplugins.org/man/check_icmp) as  host 
 command to determine a host is up and running or not.
 I think it would be handy to add a feature which would allow you to 
 return an unreachable state when "TTL expires in transit" while pinging 
 that host.
 The motivation for such an option is the following:

 In Nagios, all parent child relationships are defined correctly.
 A router can be pinged, but has a faulty route configured which makes 
 the TTL of all traffic going through it drop to 0 (routing loop) 
 resulting into a "TTL
 expired in transit" for all hosts behind it.

 As a result, despite correct parent child relationships, Nagios will 
 send out a host down notification for all those hosts.

 What are your thoughts?


 Jelle Smet

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