A Practical Guide to Fedora™ and Red Hat® Enterprise Linux®

25. system-config-firewall and iptables: Setting Up a Firewall

In This Chapter

JumpStart: Building a Firewall Using system-config-firewall 893

Introduction to iptables 895

Anatomy of an iptables Command 900

Building a Set of Rules Using iptables 902

Copying Rules to and from the Kernel 908

system-config-firewall: Generates a Set of Rules 909

Sharing an Internet Connection Using NAT 910

Objectives

After reading this chapter you should be able to:

• Explain the purpose of a packet filtering firewall

• Define and explain the uses of NAT

• Configure a basic firewall using system-config-firewall

• Copy firewall rules to and from the kernel

• Configure NAT so several clients on a LAN can use a single Internet connection

The system-config-firewall ...