[Asterisk-Users] QOS / Cisco / Asterisk

[Matt Schulte]

Yes yes, we've been through all that actually :-) We did find out it was
one of the 3550's reseting the TOS.

	-----Original Message-----
	From: rsenykoff at harrislogic.com
[mailto:rsenykoff at harrislogic.com] 
	Sent: Tuesday, January 04, 2005 2:40 PM
	To: asterisk-users at lists.digium.com
	Subject: RE: [Asterisk-Users] QOS / Cisco / Asterisk
	
	

	<snip> 
	
	
	> What's wrong with doing it by port? 
	
	We're actually using SIP to terminate calls, going by rtp.conf
the ports
	could range several thousand ports. What we're going for is only
	honoring TOS for that particular customer, luckily these are T1
	customers hosted on our routers. They understand that their
firewalls
	cannot pass TOS, if they do (ie: we packet sniff and see this)
then
	they're on their own.
	
	In a nutshell we wanted to avoid using hardcoded ports, what if
say a
	game server was in that port range (and used udp lol), you would
be
	rather screwed. 
	
	</snip> 
	
	Ahh OK. Well, how about configuring a laptop with ethereal
(http://www.ethereal.com/) and capturing the packets you have in mind?
It even runs on Windows. :p It's pretty easy to specify a particular
destination or so, for limiting which traffic you sniff. You could use
an old hub and start plugging the laptop in between routers using the
hub so it can capture the packets. Should be fairly quick to isolate
which router is modifying the TOS value. Just an idea... of course you
have to have physical access to the network... 
	
	HTH, 
	-Ron 
	

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