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Date:      Mon, 11 Sep 2006 13:34:58 +0200
From:      Greg Armer <wiqd@codelounge.org>
To:        freebsd-pf@freebsd.org
Subject:   Block Skype with PF
Message-ID:  <20060911113458.GA10659@gentoo>

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Good day list,

I was just wondering if any of you have a running 'receipe' using PF
that can block Skype.

What I have found out is the following:

- Skype picks a random port to use when it is installed
- It can switch over to port 80 / 443 if a firewall is too restrictive
- It appears UDP ports above 1024 are used aswell

So what I was thinking of doing is blocking all outgoing UDP above port
1024, and trying to identify and block the port 80 / 442 traffic with 
squid and a transparent proxy.

Does anyone have any better solutions to this which do not involve
expensive layer 7 inspection hardware ?

Many thanks for your comments / ideas.

Regards,

--
Greg Armer




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