Stevens, W. Richard; Prentice Hall; 1990; ISBN 0-13-949876-1;
772 pp.; $54 (USA).
Everything you might want to know about the subject, and some things you probably didn't want to know (really, XNS!?). Generally regarded as definitive on the basics. Two more volumes are planned.
Kirch, Olaf; O'Reilly; 1995; ISBN 1-56592-087-2; 335pp.
See
http://www.ora.com/catalog/linag/noframes.html.
A practical guide to Linux's TCP/IP and related services. Accessible on the Web at the Linux Documentation Project page, or directly at http://sunsite.unc.edu/LDP/LDP/nag/nag.html.
Hunt, Craig; O'Reilly Associates, ISBN 0-937175-82-X; 1992; 472pp.
See
http://www.ora.com/catalog/tcp2/noframes.html.
Less Linux-specific than the Kirch book. Features deeper coverage of the TCP/IP core, including routing and BGP.
Albitz, Paul, and Liu, Cricket; O'Reilly; 1996; ISBN 1-56592-236-0;
1992; 438pp; $32.95.
See
http://www.ora.com/catalog/dns2/noframes.html.
In-depth coverage of DNS, useful for people running complicated multiple-subnet installations. Covers BIND library programming.
Costales, Bryan & Allman, Eric; O'Reilly;
ISBN 1-56592-222-0; 1997; 1050 pp; $32.95
See
http://www.ora.com/catalog/sendmail2/noframes.html.
An exhaustive (and exhausting) guide to Linux's and Unix's default mail-transfer agent.