31 Mar
2003
31 Mar
'03
4:08 p.m.
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