IPCop Firewall
Overview
IPCop Linux is a complete Linux Distribution. Its sole purpose in life is to protect the network that it is installed on.
 By implementing existing technology, outstanding new technology and secure programming practices, IPCop is the Linux Distribution for those wanting to keep their computers/networks safe and sound.
IPCop is open source and is distributed under the GNU General Public License. In addition to the many obvious advantages of open source, the fact that the source is open allows security experts, worldwide, to audit and fix security holes.
Features:
A secure, stable and highly configurable Linux based firewall
Easy administration through the built in web server
A DHCP client that allows IPCop to, optionally, obtain its IP address from your ISP
A DHCP server that can help configure machines on your internal network
A caching DNS proxy, to help speed up Domain Name queries
A web caching proxy, to speed up web access
An intrusion detection system to detect external attacks on your network
The ability to partition your network into a GREEN, safe, network protected from the Internet, a BLUE network for your wireless LAN and a DMZ or ORANGE network containing publicly accessible servers, partially protected from the Internet
A VPN faclity that allows you to connect your internal network to another network across the Internet, forming a single logical network or to securely connect PCs on your BLUE, wireless, network to the wired GREEN network
Traffic shaping capabilities to give highest priority to interactive services such as ssh and telnet, high priority to web browsing, and lower priority to bulk services such as FTP.
Improved VPN support with x509 certificates.
Built from the ground up with ProPolice to prevent stack smashing attacks in all applications.
A choice of four kernel configurations, allowing you to choose an optimum configuration for your circumstances.



