[asterisk-dev] Using ethereal to diagnose problems

[Douglas Garstang]

I think ngrep uses libpcap, and that's why it, and tethereal, can't capture from multiple interfaces.

> -----Original Message-----
> From: John Lange [mailto:john.lange at open-it.ca]
> Sent: Thursday, June 08, 2006 11:50 AM
> To: asterisk-dev at lists.digium.com
> Subject: RE: [asterisk-dev] Using ethereal to diagnose problems
> 
> 
> On Thu, 2006-06-08 at 10:57 -0600, Douglas Garstang wrote:
> > I prefer to use ngrep. It's much simpler and shows you the 
> application
> > layer traffic only, which when your debugging SIP traffic 
> is all that
> > you want to see.
> 
> Not necessarily, Layer 2 stuff can often be important. Often there are
> network problems which aren't obvious until you put VoIP on 
> the network.
> People tolerate bad data networks because they assume thats 
> just the way
> it is, but bad voice is a different thing.
> 
> I think if you give ethereal a try you'll be amazed at how much more
> powerful it is than tools like ngrep.
> 
> BTW, it also can capture from multiple interfaces at once though I
> thought ngrep could do that? Doesn't ngrep use libpcap?
> 
> John
> 
> >  What would be sweet though is if there was a network 
> traffic analyser
> > that could monitor multiple interfaces at once.
> > 
> > > -----Original Message-----
> > > From: John Lange [mailto:john.lange at open-it.ca]
> > > Sent: Thursday, June 08, 2006 10:05 AM
> > > To: Asterisk Developers Mailing List
> > > Subject: [asterisk-dev] Using ethereal to diagnose problems
> > > 
> > > 
> > > Greg Boehnlein's recent post about testing Asterisk with 
> SSIP reminded
> > > me that I recently watched a presentation at our local 
> Asterisk users
> > > group about using Ethereal to trouble shoot VoIP.
> > > 
> > > Quite frankly I was blown away by how powerful Ethereal is so 
> > > I thought
> > > I'd share it here for the few of you who might not 
> already know about
> > > it.
> > > 
> > > Among other things you can grab all the traffic of the 
> > > network; select a
> > > SIP packet, ask Ethereal to find the complete conversation, do
> > > statistical analysis on it (including showing which 
> packets were lost
> > > and why), show QOS setting etc. etc. Ethereal's colorizing 
> > > also makes it
> > > easy to see all kinds of details at a glance.
> > > 
> > > You can even ask ethereal to save the voice conversation to a 
> > > .wav file.
> > > 
> > > Having just discovered this I'm far from an expert. Does 
> > > anyone know of
> > > any in-depth tutorials on analyzing VoIP with ethereal so 
> I can make
> > > even better use of it?
> > > 
> > > John
> > > 
> > > 
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