06-19-2002 11:10 AM - edited 02-20-2020 10:06 PM
In our organisation I permitted only DNS SMTP WWW & POP3 . But I find that one user still use the irc. What's the problem ?
06-20-2002 03:06 AM
Could you please provide more info, where are you enforcing this policy? is it on the PIX? or a router using ACL?
Just for your reference, here are the common chat ports you can block;
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 1863 (msn)
tcp/udp 4020 (ichat)
tcp 5000-5001 and udp 5000-5010 (Yahoo voice chat)
tcp 5050 (Yahoo messages)
tcp 5100 (Yahoo Webcams)
R/Yusuf
06-20-2002 04:12 AM
Hi
I used this in Pix & perimeter router,
Thanks
06-20-2002 05:45 PM
I would recommend you explicitly deny all the ports i mentioned above for common chat programs, let us know if that helps.
R/Yusuf
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