how do you run multiple game servers

how do you run multiple game servers
like one sand box and one dark rp

Run two servers. Put one on 27015, and another on 27016.

I think he’s talking about listen servers

If he is, you cant!

Dedicated Servers: follow whosdr’s instructions. You’ll also have to forward any ports used by the server.

Listen Servers: There is a way to do it, but I don’t recommend it and won’t list it here.

Is that the exploit that ended up filling the GMod master server with fake servers?