Slide 1

NetFilter

IPTables

IPTables and Netfilter

What are chains?

Chain Policies

User-Defined Chains

Built-in Chains

Slide 9

Jumping Chains

Jumping Chains

Vocabulary

Syntax

Examples

Actions

Actions

Actions

Actions

Actions

Matches

Generic Matches

Generic Matches

Generic Matches

Generic Matches

Generic Matches

Implicit Matches

TCP Matches

TCP Matches

UDP Matches

ICMP Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Explicit Matches

Review

Review

Review

Review

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

Targets

IPTables Policies

Review

Review

Review

Kernel Level Security

Important /proc Security Files

Important /proc Security Files

Important /proc Security Files

Important /proc Security Files

Important /proc Security Files

Important /proc Security Files

Pertinent Files and Commands

Troubleshooting IPTables

Troubleshooting IPTables

Review

Closing IPTables Comments

Final Lab