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www.netfilter.org

Netfilter and iptables are building blocks of a framework inside the Linux 2.4.x and 2.6.x kernel that enables packet filtering, network addresses [and port] translation (NA[P]T) and other packet mangling. This enable use as a firewall and router.

URLs from www.netfilter.org:

URL: http://www.netfilter.org/projects/iptables/index.html URL: http://www.netfilter.org/documentation/index.html#documentation-howto URL: http://www.netfilter.org/documentation/HOWTO/packet-filtering-HOWTO.html URL: http://www.netfilter.org/documentation/HOWTO//netfilter-hacking-HOWTO-4.html URL: http://www.netfilter.org/ URL: http://www.netfilter.org/documentation/HOWTO/NAT-HOWTO-10.html URL: http://www.netfilter.org/documentation/index.html