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Chapter 13. Firewalls and

iptables

system's version of this file. This allows you to quickly distribute sets of

iptables

rules to many

different machines.

Important

If you distribute the /etc/sysconfig/iptables file to other machines, you must type

/sbin/service iptables restart for the new rules take effect.

13.5. Additional Resources

See the sources below for additional information on packet filtering with

iptables

.

13.5.1. Installed Documentation

The

iptables

man page contains a comprehensive description of various commands, parameters,

and other options.

13.5.2. Useful Websites

http://netfilter.samba.org   Contains assorted information about

iptables

, including an FAQ ad 

dressing specific problems you may experience and various helpful guides by Rusty Russell, the

Linux IP firewall maintainer. The HOWTO documents here cover subjects such as basic networking

concepts, 2.4 kernel packet filtering and NAT configurations.

http://www.linuxnewbie.org/nhf/Security/IPtables_Basics.html   A basic and general look at the

way packets move through the Linux kernel, plus an introduction to constructing simple

iptables

commands.

http://www.redhat.com/support/resources/networking/firewall.html   This webpage contains

update to date links to a variety of packet filter resources.