How to stop Peer to Peer file sharing such as Kazaa at the router interface

[ksowell]

Is there a way to configure router IOS to block peer to peer file sharing applications like Kazaa?

[Router.tech]

Certainly. Find out what ports they use and block them on the external interface using an ACL...

[homa]

some applications are using dynamic ports, NBAR is mainly for blocking this kind of application.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad.htm

[thisisshanky]

You ll need to use NBAR< because, kaazaa 2 uses dynamic ports, so you can block port 1214 to block like kazaa1 used to be.