nanog mailing list archives

Re: State Super-DMCA Too True


From: "Petri Helenius" <pete () he iki fi>
Date: Tue, 1 Apr 2003 00:08:15 +0300


Well, most p2p apps live on well-known ports, and Cisco's QOS mechanism
allows easy classification on ports.  Yes, most of the p2p apps are
port-agile -- but only if they are completely blocked.  My experience is
that if you let the p2p stuff through, it'll stick to its default port and
you can police with impunity.

Our data shows that between 30% and 50% of p2p data flows on "non-standard"
ports if you run an unblocked environment.

Pete


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