better understanding of tcp/ip & iptables & kernel & networking

Hi, Does anybody of any good document (linux-oriented would be better :-) ) from which I can increase my knowledge of tcp/ip at the theory level and as well at the arquitectural level in the kernel and at the implementation level covering topics like how packets are constructed, what does it mean the tcp/ip uses windows to transfer, what are frames, how the kernel, tcp/ip and apps interact as well..., etc. Any pointers... Cause today I proofed that my knowledge is very superficial.... Thanks!! Raul