Documentation about the netfilter/iptables project
Documentation about iptablesDocumentation about nftablesDocumentation about the connection tracking systemThis subsystem is usually refered as conntrack in mailing
list discussion and other documentation.
Documentation about the userspace netfilter queueGeneral documentation about the netfilter and iproute2
Some of these documents might be a bit old but they still provide a general idea regarding the Linux kernel internals:
Netfilter FAQ (Frequently Asked Questions)
We have collected the most frequently asked questions (and their respective answers) from the mailinglists. Please read this FAQ first, before asking questions on the mailnglists.
English
The netfilter/iptables HOWTO'sNetfilter Extensions HOWTONetfilter Double NAT HOWTONetworking Concepts HOWTO
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