Is this still a reccomend book? I was looking for a good TCP/IP reference book, but many seemed rather old. Of course, I imagine protocols like that dont get modified too much.
Well, it's definitely out of date: the first edition predates even IPv6 (and the second edition is awful, don't buy it). Still, the way it's laid out is so well done that once you understand how TCP/IP worked in the mid-90's, you'll easily be able to work out the evolution of it since on your own. It's a shame there's no better up-to-date book, but Stevens was one-of-a-kind. The Comer book isn't bad (but it's not really good, either), and the Kurose & Ross book is less not bad (and more not good), but even though both are more modern, I'd still recommend TCP/IP Illustrated to really understand what's going on in the network stack.