I have an web application that listens to requests on port ####. I need to
write an app, that will monitor port #### and capture all incoming packets,
process them and dispatch them packet to it's final destination.
I have no clue where to start. Could you guys give me some documentation
links, or book recomendations that would give me some ideas, to understand
it, and think about a way of how to write it ?

Thanks in advance.

Felipe Garcia