If u have a problem with your router and you can't join the rooms on Vp3 lobby and you tried to set IP2IP room and it didnt work either so there is a way to play vp3 online using a program called hamachi
just download it from this link: http://hamachi.en.softonic.com/download
install hamachi click on join network u ll need a login and pass of ur friend or create you own network and invite your friends to join
then u ll only need to run vp3 and set ip2ip room and put your friend hamachi ip in join session
have a good game;
THANKS TO Q-stix he showed me how to use hamachi to play vp3.
GL :)