June 2000
Intermediate to advanced
512 pages
15h 18m
English
Content preview from Linux Network Administrator's Guide, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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IP Firewall Chains (2.2 Kernels)
Most aspects of Linux are evolving to meet the increasing demands of its users; IP firewall is no exception. The traditional IP firewall implementation is fine for most applications, but can be clumsy and inefficient to configure for complex environments. To solve this problem, a new method of configuring IP firewall and related features was developed. This new method was called “IP Firewall Chains” and was first released for general use in the 2.2.0 Linux kernel.
The IP Firewall Chains support was developed by Paul Russell and Michael Neuling.[63] Paul has documented the IP Firewall Chains software in the IPCHAINS-HOWTO.
IP Firewall Chains allows you to develop classes of firewall rules to which you may then add and remove hosts or networks. An artifact of firewall rule chaining is that it may improve firewall performance in configurations in which there are lots of rules.
IP Firewall Chains are supported by the 2.2 series kernels and are also available as a patch against the 2.0.* kernels. The HOWTO describes where to obtain the patch and provides lots of useful hints about how to effectively use the ipchains configuration utility.
Using ipchains
There are two ways you can use the ipchains utility. The first way is to make use of the ipfwadm-wrapper shell script, which is mostly a drop-in replacement for ipfwadm that drives the ipchains program in the background. If you want to do this, then read no further. Instead, reread the previous ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.