[luau] IBM - Introduction to Netfilter/iptables

[Warren Togami]

http://www-106.ibm.com/developerworks/security/library/s-netip/?t=gr,lnxw02=LinuxFirewall

Configuring firewalls for Linux (kernel 2.4.x) using netfilter/iptables

Mugdha Vairagade (vmugdha at indiatimes.com)
Independent Developer
September 2002
The netfilter/iptables is the IP packet filtering system that is
integrated with the latest 2.4.x versions of the Linux kernel. This
system facilitates greater control over IP packet filtering and firewall
configuration on Linux systems, be they systems connected to the
Internet or a LAN, servers, or proxy servers interfacing between a LAN
and the Internet. Mugdha Vairagade provides an introduction to the
netfilter/iptables system, how it works, its advantages, installing and
configuring, and how to use it to configure firewalls on Linux systems
to filter IP packets.

Note: Minimum intermediate level knowledge of Linux OS and experience of
configuring Linux kernels will be helpful in understanding this article.

For this article, we are using iptables userspace tool version 1.2.6a
and kernel version 2.4.9.
(continued in article)