RE: how can I track networked games

From: Alex Arndt (
Date: 01/04/02

From: "Alex Arndt" <>
To: "Mike Gilles" <>, <>, "Jamie French" <>, <>
Date: Thu, 3 Jan 2002 19:27:20 -0500


An important port to add to your list would be Microsoft DirectPlay.
This is the networking portion the DirectX suite and binds to one
distinct port - UDP 28800.

Any game that is DirectX compatible will normally use this port, but
as Jamie pointed out, there's no guarantees that you'll always see
play on the default ports.

In any case, the best way to find those games is using either your
sniffers or monitoring your throughput on the outbound interface of
your border router. A sudden spike in high port UDP (especially around
lunch or at the beginning/end of the day) is a pretty good sign some
gaming is going on.

Hope this helps!

Alex Arndt, GCIA
"Within all order is the potential for chaos..."

-----Original Message-----
From: Mike Gilles []
Sent: Thursday, January 03, 2002 4:12 PM
Subject: RE: how can I track networked games


Here's a list of the ports "typically" used by some of the most popular
online games currently.
So here they are:

Half Life, TFC:
any to or from 27005
any to or from 27015
any to or from 27016

Quake 3: Arena:
any to or from 26000, 27000, 27910, 27960

any to or from 6112

Quake II:
any to or from 27901
any to or from 27910

any to or from 27500
any to or from 27001

any to or from 7777

Diablo2 and Battlenet:
any to or from 6112
any to or from TCP 116, 118
BTW: No one plays DOOM anymore, but if they did, I think it operates on UDP
port 666.

Hope this helps,

 Michael John Gilles
 Lead Security Engineer, MCSE
-----Original Message-----
Sent: Thursday, January 03, 2002 10:39 AM
Subject: how can I track networked games

I would like to watch for networked games (such as Doom), but it seems they
use a multitude of options for connecting. I found clients that connect via
IPX, TCP, UDP and Server side Java applets just poking around the Internet.

Any help with Snort rules or general strategies for monitoring these will be

Thanks in Advance.


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