Linux Server Administration: Basic Linux Firewalls

Posted by jennyrl on Mar 4, 2008 8:46 AM EDT
lpmagazine.org; By Mark Rais
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In this article Mark Rais shares some of the basics of setting up a Linux firewall using the iptables tool. It includes a review of some firewall options, basics of getting started, details of the iptables syntax and some example configurations.

Creating properly functioning firewall rules is dependent upon your knowledge of what your server is doing.

For a secure server, it is best to establish rules that will DENY all incoming traffic. Once you do so, then you can make explicit rules that only allow exceptions such as for port 80 requests. This is far more comprehensive than trying to filter out things you want to block, because you could miss something important such as one open port that will be used to attack your server.

It is also beneficial to use iptables in conjunction with a hardware firewall...

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it's a start tuxchick 7 1,026 Mar 4, 2008 4:12 PM

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