Socket Programming

[theChameleon]

hi, i'd like to know how to program something to get past the router to contact a particular host connected to it.


theChameleon -----> router -----> Internet -----> router ------> target

how do i reach the target if there's a server program on it, and if there's no server program on it (kinda like, trying to connect to his port 80, or something similar).


oh yes, another question...

wat APIs and/or language is used to make the computer send packets with a particular flag (SYN/ACK/RST... etc) set? can somebody point me in the right direction?



u can assume that i already have the knowledge on the basics socket programming.

thanks in advance.

[tgoe]

libnet and miniupnp