Low level networking in assembler (x86 compatible)

I wish to write a bootable program in assembler that would be capable of sending and receiving network packets. I do not wish to use any libraries, I'd like to create it all by myself (and also learn while doing so). Unfortunately, I was unable to find any information regarding communication with the network card on the lowest level (sending raw sockets). I believe it's necessary to use OUT and IN instructions, although I couldn't find any information about the port that is assigned to the network card (or how to find it, if it's not always the same). Could anybody point me in the right direction? ;-)