Then either start up sourceforts and click "create server" or set up a machine on your network as a dedicated server. But if you do this you must have a connection with a very fast upspeed. As 011003 said, Cable/DSL won't work with more than about 4 players before everyone starts getting insane amounts of lag. Even if your service has screaming fast download speeds, you MUST have a very fast UPspeed to run a server well. You probably don't have anything close to necessary because most ISPs don't offer this to residential users.
As for doing it without a router, the question makes no sense. Do you just have one machine in your house connected to the internet? If you have more than one, you probably already have a router.
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