TCP/IP Guide by Charles Kozierok
I just bought this book the other day. It is a comprehensive reference for almost all things TCP/IP. I will probably be posting some of the things I come across in this book that I think are useful or that I think would be helpful for others to know about as well.
I will also give my final thoughts on this book after I finish reading and studying its contents. I'm sure that this book will definitely be going into my library of reference materials.