December 2000
Intermediate to advanced
800 pages
22h 41m
English
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User-Defined Chains
User-defined chains provide a way to group rules logically. These chains are called from built-in chains as targets. At any point in the chain, you can call a user-defined chain from the same table. When a user-defined chain terminates with no matches, it returns to the next argument in the calling chain.
When creating user-defined chains, names should be lowercase because uppercase is reserved for built-in chains and targets. The name cannot be one of the built-in names or special values.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.