A Practical Guide to Red Hat Linux: Fedora Core and Red Hat Enterprise Linux, Second Edition

Chapter 25. iptables: Setting Up a Firewall

IN THIS CHAPTER
How iptables Works
Rules, Matches, Targets, and Chains
Network Packet
Jumps and Targets
JumpStart: Using system-config-securitylevel to Build a Firewall
Anatomy of an iptables Command
Building a Set of Rules
A Rule Set Generated by system-config-securitylevel
Sharing an Internet Connection Using NAT

The iptables utility builds and manipulates network packet filtering rules in the Linux kernel. You can use iptables to set up a firewall to protect your system from malicious users and to set up NAT (Network Address Translation, page 984), which can allow multiple systems to share a single Internet connection. The iptables utility is flexible and extensible, allowing you to set up simple ...