From: Church, Chuck (cchurch@xxxxxxxx)
Date: Wed Jun 19 2002 - 11:46:59 GMT-3
Many of these will use multiple ports, including TCP 80 (http). Your best
bet is to block all traffic going to (or coming from) the networks that host
their servers which provide these services. Install the application on your
PC, connect to the service, and then go to a DOS window and do a netstat.
That'll list all your TCP connections. Or use a Sniffer. ARIN.net will
also help you find out what address ranges belong to a certain company.
It's a pain, but it's good access list practice!
Chuck Church
Sr. Network Engineer
CCIE #8776, MCNE, MCSE
US Tennis Association
70 W. Red Oak Lane
White Plains, NY 10604
914-696-7199
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Kurt Kruegel
Sent: Wednesday, June 19, 2002 9:54 AM
To: Sam.MicroGate@usa.telekom.de
Cc: ccielab@groupstudy.com
Subject: Re: port numbers
this might be harder than you think,
for instance if you want to stop realaudio.
by default it's configured to use rtsp, single tcp , udp in that order i
believe.
so if you stop one it moves on till it finds a transport.
i haven't checked aim but i suspect a dynamic udp transport.
Sam.MicroGate@usa.telekom.de wrote:
> Hello group,
>
> I want to block msn, aim and yahoo chat in my firewall. I need someone to
> tell me the port numbers for these application or where I can find them.
> Thanks.
>
> Sam
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