June 4, 2004

Firewalling with netfilter/iptables

iptables is Linux's firewall which has been a part of the kernel since version 2.4. It is often referred to as a packet filter as it examines each
packet transferred in every network connection to, from, and within your computer. iptables replaced ipchains in the 2.4 kernel and added many new
features including connection tracking (also known as stateful packet filtering). In this article we will use iptables to build simple but effective
firewalls for the following scenarios using allow/disallow rules based on IP addresses, ports, and states...

Link: linuxgazette.com


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