Multiplayer Game Programming Links

Miami Deluxe- DSL modems Setting up DSL/Cable modems, and setting up multiplayer games on a LAN, and through the Net at the same time.
Distributed Virtual Reality -- An Overview This is a very good paper on multiplayer game theory- I thoroughly recommend you read it!
Some Thoughts on Behavior in VR Systems And this is a companion piece to the above- with more detail on objects in a multiplayer world.
Gamespy Gamespy is a program to put players on the net in touch with one another.
Kali Kali is like Gamespy, and to make IPX only (PC LAN only) games playable over the net.
MBONE: Multicasting Tomorrow's Internet Multicasting may be a way of hosting games with a huge amount of players effectively- I don't know how big the lag times would be though.
Quake Network Protocol Specs This is details on the Quake network protocol specs.
John's Web Page: Multiplayer Quake This is a basic set-up guide to getting multiplayer Quake running.
The XPilot Page This is a multiplayer, open-source, Internet space combat (gravity) game.
Introduction To SocketWrench Some basics on Internet theory and programming.
Blues News Multiplayer Game News.