KBTAG: kben10000023
URL: http://www.securityportal.com/lskb/10000000/kben10000023.html
Date created: 13/04/2000
Date modified:
Date removed:
Authors(s): Kurt Seifried seifried@securityportal.com
Topic: How to get through firewalls
Keywords: Network/Firewalls
Firewalls are almost ubiquitous now, every network attached to the Internet has one. Sometimes they are misconfigured, or otherwise setup in such a way as to prevent users from access the Internet properly. Additionally administrators should know what tricks internal users can use to sneak information out of the corporate LAN.
A document describing this in depth is available at: http://www.linuxdoc.org/HOWTO/mini/Firewall-Piercing.html. Typically most firewall piercing is accomplished by running PPP over another protocol such as SSH, Slirp or telnet, blocking this can be difficult.