[Setokaiba]

O modo correto de configuração é esse:

Login Server:

# Bind ip of the LoginServer, use * to bind on all available IPs
LoginserverHostname = *
LoginserverPort = 2106
# How many times you can provide an invalid account/pass before the IP gets banned
LoginTryBeforeBan = 10
# Time you won't be able to login back again after LoginTryBeforeBan tries to login. Provide a value in seconds. Default 10min. (600)
LoginBlockAfterBan = 600

# The address on which login will listen for GameServers, use * to bind on all available IPs
LoginHostname = *

# The port on which login will listen for GameServers
LoginPort = 9014

Game Server:

# Bind ip of the gameserver, use * to bind on all available IPs
GameserverHostname = *
GameserverPort = 7777

# This is transmitted to the clients connecting from an external network, so it has to be a public IP or resolvable hostname
# If this ip is resolvable by Login just leave *
ExternalHostname = l2secretwarez.net ---> Aqui o seu No-IP

# This is transmitted to the client from the same network, so it has to be a local IP or resolvable hostname
# If this ip is resolvable by Login just leave *
InternalHostname = 127.0.0.1

# The Loginserver host and port
LoginPort = 9014
LoginHost = 127.0.0.1

No l2.ini para os jogadores tu põe o que está no Externalhostname, em rede tu põe o IP de rede do computador que está o servidor.