Hehe, don't know what I am up to? Well I am reading this book on TCP/IP and now I find it dull that I just need to do some system calls and I have a connection. I want to see and send all those packets by myself, setting the ACK-flag manually along with the destination IP and then send it out to cyberspace. I am trying to learn about how TCP/IP works and I want to be able to play with it as I learn.
I will check those two links. See if they are good enough.
EDIT: I have started reading part 1, think I understand now what you ment with "don't know what you're up to".