I thought I had a good understanding of TCP/IP, but with the need to grasp Mail Services and SSH, I started to get lost.
This book helped me no end. I read it through cover to cover and it gave me a much better understanding of not only TCP/IP but some of the more popular services that run over it. It covers basic TCP/IP methodology (including the dreaded ISO seven layer model), through subnet masking and routing as well as basic DNS, Sendmail and Apache configuration.
I now feel I can go back and read the Bat (Sendmail) and Grasshoppers (DNS & BIND) books and get a lot more out of them.
This book looks like it will fit firmly in among the numerous other O'Reilly books on my desk. I'm thinking - do O'Reilly offer a discount if I buy all of there books ;-)
I would recommend this book to people who think they know enough to get by, and those just entering into the world of TCP/IP.