From: Larry Pitcher (pitcherlbakerboyer.com)
Date: Tue Apr 13 2004 - 17:20:57 CDT

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Try blocking all destination ports above 1023 going out to the internet...
You will probably break some things that will need exceptions to the rule,
but then you'll be covered.

Larry Pitcher
Internet Product Manager
Baker Boyer National Bank
509.526.1429
 <mailto:pitcherlbakerboyer.com> pitcherlbakerboyer.com

-----Original Message-----
From: Harper, Patrick [mailto:patrick.harperphns.com]
Sent: Tuesday, April 13, 2004 2:05 PM
To: Rowland, Krisa W ERDC-ITL-MS Contractor;
snort-userslists.sourceforge.net
Subject: RE: [Snort-users] Chat/IM

from a quick Google search (I have done this before but I did not remember
off the top of my head)
 
Yahoo Messenger
 
cs1.yahoo.com
cs2.yahoo.com
cs3.yahoo.com
 
port
5050 (I would just block them in general instead of worrying about ports)

 
------------
 
AIM
 
205.188.3.160
205.188.7.176
205.188.7.172
205.188.7.168
205.188.7.164
205.188.5.208
205.188.5.204
205.188.3.176
 
-------------
MSN Messenger
 
messenger.hotmail.com
TCP/1863

Patrick S. Harper | CISSP RHCT MCSE
Information Security Engineer
patrick.harperphns.com

  _____

From: Rowland, Krisa W ERDC-ITL-MS Contractor
[mailto:Krisa.W.Rowlanderdc.usace.army.mil]
Sent: Tuesday, April 13, 2004 2:54 PM
To: Harper, Patrick; snort-userslists.sourceforge.net
Subject: RE: [Snort-users] Chat/IM

Yes - I know it's wishful thinking - but just wondering if anyone had had
any luck doing this.

-----Original Message-----
From: Harper, Patrick [mailto:patrick.harperphns.com]
Sent: Tuesday, April 13, 2004 3:53 PM
To: Rowland, Krisa W ERDC-ITL-MS Contractor;
snort-userslists.sourceforge.net
Subject: RE: [Snort-users] Chat/IM

outbound firewall rules?
 

Patrick S. Harper | CISSP RHCT MCSE
Information Security Engineer
patrick.harperphns.com

  _____

From: Rowland, Krisa W ERDC-ITL-MS Contractor
[mailto:Krisa.W.Rowlanderdc.usace.army.mil]
Sent: Tuesday, April 13, 2004 1:26 PM
To: 'snort-userslists.sourceforge.net'
Subject: [Snort-users] Chat/IM

Does anyone have an effective way of blocking chat/IM?

Krisa Rowland
ERDC Information Assurance Team
(SAIC Contractor)
3909 Halls Ferry Rd., Bldg. 8000
Vicksburg, MS 39180
601-634-2493
krisa.w.rowlanderdc.usace.army.mil

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