[asterisk-dev] Using ethereal to diagnose problems

[John Lange]

Odd, my ethereal can capture from multiple interfaces at the same time.
Maybe it just triggers multiple instances of libcap? I don't know but it
works.

John

On Thu, 2006-06-08 at 13:00 -0600, Douglas Garstang wrote:
> 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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