This document is a WORK IN PROGRESS.
This is just a quick personal cheat sheet: treat its contents with caution!
iptables is a user-space utility program that allows a system administrator to configure the IP
packet filter rules of the Linux kernel firewall. The filters are organized in different tables,
which contain chains of rules for how to treat network traffic packets. Different kernel modules
and programs are currently used for different protocols:
iptables applies to IPv4,
arptables to ARP, and
ebtables to Ethernet frames.
Table of contents¶
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