The Quake 3 network architecture is also a fantastic read.
Anybody wanting to learn how to implement netcode should definitely read them.
The first time I implemented a UDP gameserver, they were invaluable resources for the logic required if you don't already understand how it works. (Selective msgs require acks, most don't, most don't need resends, etc).
The first time I implemented a UDP gameserver, they were invaluable resources for the logic required if you don't already understand how it works. (Selective msgs require acks, most don't, most don't need resends, etc).