Re: Blocking Music Sharing.

["Kristian Hermansen" <khermansen () ht-technology com>]

MessageA somewhat expensive, but highly configurable, solution is available from http://www.Packeteer.com.  They sell 
devices called "Packet Shapers", which filter data to layer 7 based on your config.  These devices normally have a nice 
web interface (http port 80) if your not familiar with how to config manually using other linux solutions.  The nice 
thing about them is that they are dedicated hardware devices, so they are much better at analyzing large traffic 
volumes.

Kris Hermansen

  ----- Original Message ----- 
  From: Bergeron, Jared 
  To: full-disclosure () lists netsys com 
  Sent: Monday, September 15, 2003 1:59 PM
  Subject: RE: [Full-disclosure] Blocking Music Sharing.


  I think the key here is a strong enforceable communicated policy and then identifying the traffic and addressing the 
user. I would go with an IDS (Snort is a good choice to IDENTIFY as you can easily write the sigs). Now granted Snort 
could pick it up on different ports depending on what it was looking for, however you need to think about tunneled 
connections via ssh and ssl. A good client inventory app seems to be the best way to catch these. Ahhh big brother and 
his tools.

  Regards,
  ---------------------
  Jared Bergeron
  Systems Analyst / E-Security
  XEROX Office Printing Business 


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  From: Jason Bethune [mailto:jbethune () town kentville ns ca] 
  Sent: Monday, September 15, 2003 10:07 AM
  To: full-disclosure () lists netsys com

   

  Snort is one tool used by alot of IT guys to block file sharing programs. THe trouble with these programs is that 
they have built in port "movers" that will scan the local network to find an available port to work on. Scripting is 
one way to do it....but that mostly just alerts you to the fact that there is traffice being used on your network for 
file sharing. I would like to know an exact way to block file sharing as well...

   

  Jason Bethune

   

  IT Specialist

  Town of Kentville

  354 Main Street

  Kentville, NS 

  B4N 1K6

   

  www.town.kentville.ns.ca

   

   


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  From: full-disclosure-admin () lists netsys com [mailto:full-disclosure-admin () lists netsys com] On Behalf Of 
Johnson, Mark
  Sent: Monday, September 15, 2003 1:37 PM
  To: full-disclosure () lists netsys com
  Subject: [Full-disclosure] Blocking Music Sharing.

  Due to the legal issues, I am trying to block access to sites like Kazaa and Limewire in the office.  If I am not 
mistaken, these networks can use different ports each time, so there is no way to block it at the firewall.  Is this 
right?  And if so, what is the best way to block access to these types of sites?

   

  Many thanks,

  Mark J.