NETWORK PRESENCE ABOUT SERVICES PRODUCTS TRAINING CONTACT US SEARCH SUPPORT
 


Search
display results
words begin  exact words  any words part 

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

FW: [FW1] Napster - how does it work at port level?




Check out these articles on infosecuritymag.com...
http://www.infosecuritymag.com/articles/november00/columns_news_views.shtml
http://www.infosecuritymag.com/articles/february01/cover.shtml



-----Original Message-----
From: Karim K Ismail/Toronto/IBM [mailto:[email protected]]
Sent: Thursday, March 01, 2001 5:57 PM
To: fw-1-mailinglist
Subject: [FW1] Napster - how does it work at port level?




hello

does anyone know how napster is able to work from behind the firewall,
even though the firewall
doesn't permit any outbound tcp high-ports and also drops all traffic
initiated from outside?

if i am correct, by the laws of TCP/IP, the only thing coming back should
be on the same established connection,
and that would be governed by what you allow outbound on your firewall.  i
don't permit any inbound traffic, and yet have users able to use napster.
the only ports i allow outbound are http/https.   is it possible that
napster sets itself up such that it does its peer-to-peer file-sharing
through any available open port, in this case tcp/80 and 443?

any feedback would be appreciated!

rgds,

-k




============================================================================
====
     To unsubscribe from this mailing list, please see the instructions at
               http://www.checkpoint.com/services/mailing.html
============================================================================
====


================================================================================
     To unsubscribe from this mailing list, please see the instructions at
               http://www.checkpoint.com/services/mailing.html
================================================================================



 
----------------------------------

ABOUT SERVICES PRODUCTS TRAINING CONTACT US SEARCH SUPPORT SITE MAP LEGAL
   All contents © 2004 Network Presence, LLC. All rights reserved.