A Practical Guide to Ubuntu Linux

Chapter 26. firestarter and iptables: Setting Up a Firewall

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IN THIS CHAPTER

JumpStart: Building a Firewall Using the firestarter Firewall Wizard	888
firestarter: Maintains a Firewall	890
How iptables Works	896
Rules, Matches, Targets, and Chains	896
Anatomy of an iptables Command	900
Building a Set of Rules	901
Copying Rules to and from the Kernel	907
Sharing an Internet Connection Using NAT	908

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The firestarter utility is a user-friendly, graphical front-end for iptables; iptables builds and manipulates network packet filtering (page 1052) rules in the Linux kernel. You can use firestarter, or iptables directly, to create a firewall that protects a system from malicious users and to set up NAT (Network Address Translation, ...