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# Linux 2.4 Packet Filtering HOWTO

## Rusty Russell, mailing list `netfilter@lists.samba.org`

$Revision: 1.2 $ $Date: 2002/02/19 11:33:43 $

This document describes how to use iptables to filter out bad packets for the 2.4 Linux kernels.

## 1. Introduction

## 2. Where is the official Web Site? Is there a Mailing List?

## 3. So What's A Packet Filter?

- 3.1 Why Would I Want to Packet Filter?
- 3.2 How Do I Packet Filter Under Linux?

## 4. Who the hell are you, and why are you playing with my kernel?

## 5. Rusty's Really Quick Guide To Packet Filtering

## 6. How Packets Traverse The Filters

## 7. Using iptables

- 7.1 What You'll See When Your Computer Starts Up
- 7.2 Operations on a Single Rule
- 7.3 Filtering Specifications
- 7.4 Target Specifications
- 7.5 Operations on an Entire Chain

## 8. Using ipchains and ipfwadm

## 9. Mixing NAT and Packet Filtering

## 10. Differences Between iptables and ipchains

## 11. Advice on Packet Filter Design

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