Where can I get netfilter/iptables?
Netfilter and IPtables are integrated in the Linux 2.4.x kernel series. Please obtain a recent kernel from http://www.kernel.org/ or one of its mirrors. The userspace tool ‘iptables’ is available at the netfilter homepage on one of the mirrors at http://www.netfilter.org/, http://www.iptables.org/, http://netfilter.samba.org/, http://netfilter.gnumonks.org/ or http://netfilter.filewatcher.org/.