using Nagios to find cause(s) of jitter in VoIP network

[Rob Groome]

On Jul 6, 2007, at 10:56 AM, Rogelio Bastardo wrote:

> How might one use Nagios to monitor an MPLS SLA (service level  
> agreement)?
>
> Some VoIP phones are experiencing jitter, and I'm looking for tools  
> (ideally, Nagios-friendly) which might help me find the chokepoint(s).
>
> Any help showing in the right direction would be greatly appreciated.


Before you get to Nagios, you need to sniff your network and figure  
out what is happening on those phones and see what their traffic is  
doing.  Use ethereal if you have it or download wireshark to see what  
traffic is being passed.  Once you determine what the issue is you  
will likely have to write something - or find something already  
written - that will do what you need, but this sounds somewhat  
location specific.  This is beyond nagios to help diagnose the  
problem, as you need to diagnose before you can monitor in this case.

Also - look at your switches interface stats to determine if you have  
runts, retransmits etc....



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