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I only know about:

1) Internetworking with TCP/IP: Vol.II, Design, Implementation, and Internals

2) TCP/IP Illustrated, Vol. 2: The Implementation

but these are quite dated. I am particularly interested in Open source implementations. Any ideas?

EDIT: I found another book

1) TCP/IP Architecture, Design and Implementation in Linux

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closed as off topic by Ulrich Dangel, bahamat, Renan, jasonwryan, jw013 Aug 31 '12 at 20:24

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This probably belongs on ServerFault. – bahamat Aug 9 '12 at 17:41
@bahamat: I asked this question there and it was closed. – Bruce Aug 9 '12 at 17:45

The Design and Implementation of the FreeBSD Operating System chapters 12 (Network Communication) and 13 (Network Protocols).

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Unless you are particularly interested in *nix kernel implementations of the TCP/IP stack I would recomend that you take a look at lwIP implementation. The implementation is small enough to grasp without that much problem, and it pretty well documented.

Take a look at the Rx flowchart and the wikia web site.

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There's a significant difference between TCP/IP, the protocol specification and various implementations.

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