Has anyone seen the list of ports to open\close for BF4 yet??
I dont know why you even should open ports. If you have any issues than contact the support but I dont know anybody who had problems with the MP of BF3. The COOP had port problems but there is no coop anymore so yea...
You won't have to forward/open any ports as long as all outbound traffic is allowed. You'll only need incoming port forwarding for stuff such as hosting multiplayer games (which you can't in BF3/BF4) and for some voice features in other games (again not here).
it must be the same port numbers on bf3, so there are still active on my modem
Just tried this and it crashed after 20 min in my first game.