/usr/share/doc-base/packet-filter is in iptables 1.4.21-1ubuntu1.
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Title: Linux 2.4/2.6 Packet Filtering HOWTO
Author: Rusty Russell
Abstract: This document describes how to use iptables to filter
IP packets for the 2.6+ Linux kernels.
Section: Help/HOWTO
Format: HTML
Index: /usr/share/doc/iptables/html/packet-filtering-HOWTO.html
Files: /usr/share/doc/iptables/html/packet-filtering-HOWTO*.html
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