Hi gentleman... I am facing an interview next week to get myself a really nice job on network development. And I know they will ask me about net protocols and protocol's structure and stuff like that... So, I want to be prepared for it. Then, I got a doubt. Its possible to hook every packet that is going out from my computer on specified port ? I mean, I just want to know if it is possible. Really thanks for you attention!

You say "hook" the packets? Do you want to process them programmatically?

In principle you could use something like Ethereal or Tcpdump (Versions are available for some win32-based OSs, but I don't know how well they work on XP SP2) to capture packets being sent / received.

Ethereal is free of charge and has some advanced packet analysis features.

Packets can be saved into a file in an open format which you can then write a program to read if necessary.

Mark

Im also pretty sure you can create your own version of winsock2.dll (sp?)
and place it in the same folder as the application.
And make sure that you just pass each function to the real "winsock2.dll". *after you have extracted all the information you need ofcource.