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Understanding IPTABLES

Disclaimer Packet filtering is something I've always hard a hard time getting my head around. Not the basics; that's easy enough. It's just the incredible level of detail, the difficulty of keeping it all in your head at once. And then, of course, there are all the different flavors: ipfw, ipfilters, ipchains, and now iptables. It gets more than a little confusing, and I've never…