Installation guide

176 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.