Sebikuh's post in i can connect to server with own pc... other pc can't go to character selection screen... was marked as the answer
hi
i have read an older post about wan ip and it's a bigger problem
at first the configs from you are correct only in subnet there you need only one row
next check your ports here pls
edit:
it's not easy to configure a server with wan ip cause the ports are blocked from anti virus, router or your provider
when you want to play with your friend's pls try this program hamachi