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by Ramesh Natarajan on February 15, 2010

As part of the contest we conducted recently, we got from the geeky readers who choose their favorite firewall.

Based on this data, the top spot goes to.. drum roll please..

If you are new to any of the top 5 firewalls mentioned here, please read the rest of the article to understand more about them.

iptables is a user space application program that does packet filtering, network address translation (NAT), and port address translation (PAT).  iptables is for IPv4.  ip6tables is for IPv6.

iptables needs kernel with ip_tables packet filter (including Linux kernel 2.4.x and 2.6.x). Using iptables you can view, add, remove or modify the rules in the packet filter ruleset.

IPCop is for small-office and home-office users. This is a Linux firewall distribution, that requires a separate low power PC to run the software. You can configure the firewall rules from a friendly web interface. This is a stateful firewall based on Linux netfilter.

You can take an old PC and convert it to a secure internet application with IPCop, which will secure the home/small-office network from internet and also improve web browser performance by keeping some frequently used information.

Shorewall firewall s tag-line is: iptables made easy. It is also known as Shoreline Firewall . It is built upon the iptables/ipchains netfilter system.

If you have hard-time understanding the iptables rules, you should try shorewall, as this provides a high level abstraction of iptables rules using text files.

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