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Is there a way to block ppl using Instant messenger recieving any files

I am not sure if this is answered previously but if someone knows and help me out here

Is there a way to block ppl using Instant messenger recieving any files thru that. Also How to block different peer to peer file sharing softwares out there. I have a PIX 515 (6.1). Any help will be greatly appreciated.

Thanks

1 REPLY
Cisco Employee

Re: Is there a way to block ppl using Instant messenger recievin

MSN uses TCP port 1863 for chat. Not sure but either it uses the same port or some high TCP port to transfer files. You can put a sniffer and see what ports is it sending the files through and block them. For your reference, below are some other port info.

common chat ports:-

tcp 1863 (msn)

tcp 6667 (irc) 6660- 6670 (the default being 6667).

tcp 6665-6669 (common IRC)

tcp 5190 (aol)

tcp 5190, dyn >=1024 (aol ICQ)

tcp/udp 5190-5193 (aol)

tcp/udp 4020 (ichat)

tcp 5000-5001 and udp 5000-5010 (Yahoo voice chat)

tcp 5050 (Yahoo messages)

tcp 5100 (Yahoo Webcams)

HTH

R/Yusuf

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