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Re: Kazaa
From: trains () doctorunix com
Date: Sun, 02 Apr 2006 21:09:38 -0500

Quoting James_gmail-ij <ij3n0spam () gmail com>:

Other than removing Kazaa and preventing installation, how else can I block
it from being used?

At the firewall, with some additonal programming. There was an article in one of the Linux Magazines - LinuxJournal? - some time ago. Dont have the Mag. to hand.

I remember this article:   http://linuxjournal.com/article/6945

There are various modes, designed to evade trivial block rules. The
article examines
the protocols in detail and describes how to defeat it completely.

At the time, I used the article's info to put together some snort rules, etc, but the protocol proved to be very adaptive. and it has mutated since 2003.

My current best effort is to not block the initial conversation setup. the same goes for bittorrent. If you try to block it, it just keeps adapting till it gets through. you will lose that game. What I do instead is capture the initial kazaa and bittorrent traffic with snort, then shun the outside servers for one hour. It doesn't stop kazaa or bittorrent from working, but it does make the products work very, very poorly. Over time, we have seen a significant drop in the amount of traffic, and bittorrent traffic has dropped to nearly zero.

The reason you have to let the initial traffic burst out is because the first protocol it tries is easy to monitor and dissect. the later, adaptive traffic is harder to associate and dissect.

t


-------------------------------------------------
Email solutions, MS Exchange alternatives and extrication,
security services, systems integration.
Contact:    services () doctorunix com


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