Wie heissts noch so schön.... Lesen bildet.
Auszug aus der n4server.txt im N4 Ordner.
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RUNNING MULTIPLE SERVERS
If you want to run more than one server on a single machine or from behind a firewall, you will need to give each of the servers its own unique port range for client/server communications, and also include these port ranges in the ipautofw rules or router configuration if applicable. To do this you would specify a unique net_server_port for each server, remember to leave room between each net_server_port settings for the server's ping port and client connection ports.
For example, if you were going to allow 20 clients to connect to each of your two servers you could leave the first server on the default net_server_port of 32766. You would need to reserve 21 ports for ping and clients, so the next available port for the second server to use as it's net_server_port would be 32788.
Using a single installation of the game you may use the command line override to start additional instances of the server, each with their own settings. In the above example the first server would be started normally to use the default settings, and the second instance would use the following command line option to set it's net_server_port to 32788:
-ko"0:communications:net_server_port:32788"
For more information see the "Command Line Override for Game .INI Settings" section above.
Note that on a LAN, clients will only see race servers broadcast to the Local Races table that are using the default net_server_port. In order to connect to servers using other net_server_ports, clients will need to manually enter both the server's IP address as well as the port number (in the format n.n.n.n

ort). In the above example, if the IP address of the server was 192.168.1.2 clients would need to connect to 192.168.1.2:32788.
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Bei GPL ists so ähnlich, da musste mal in die dazugehörige Readme schauen.
Gruss
Arvid