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Filtering traffic based on thousands of IPs efficiently

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HowTos

Trying to insert 70.000 rules in iptables on a recent machine takes about an hour and going through these rules for each packet is even more of a burden. But iptables can send packets to userspace to be handled there. This article describes how to filter network traffic based on thousands of IPs with a new tool called nfqueue efficiently.

Prerequisites
nfqueue requires a 2.6.14 kernel or later with the option CONFIG_NETFILTER_XT_TARGET_NFQUEUE enabled (module or build-in). On a standard Debian installation (Etch) the additional packages libnetfilter-queue1 and
Installation
Install prerequisites
aptitude install libnetfilter-queue1 libnfnetlink1

Get the Debian nfqueue package and install it
wget http://nfqueue.sf.net/debian/nfqueue_0.11-1_i386.deb
dpkg -i nfqueue_0.11-1_i386.deb

Overview
IP ranges are specified in p2p, dat, csv text files or in nfq binary format.

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