Killerwall

Killerwall is a script that sets the iptables upon startup with a init script.

killerwall's home page is http://www.killerwall.net/

What is Killerwall? Killerwall is a firewalling script for Linux 2.4 - 2.6 using Iptables. It is an sh shell script. The madness behind that is to use entirely POSIX tools to do it's job (sed, grep, awk...etc).

What can it do for you? A lot of thought has gone into the design of this script to make it flexible enough to be easy to use and administer, yet still be powerful.

Take advantage of Iptables stateful capabilities to provide practically transparent firewalling. If you also desire, it's trivial to configure Killerwall for absolute stealth. It is configured by default with *ALL* ports closed. Inbound connections will not be accepted unless initiated by your firewall or NAT client. While it's easily configured to open ports to everyone, unless you're a server offering services, doing so isn't necessary or advisable.