how to synchronize physics over network

[sjinny]

the basic purpose :

• make sure the position and moving of any entity are correct.for example, you can't walk through a wall, you won't fall into the ground.
• make sure the position and moving of any entity are synchronized among the server and the clients.
• make sure the position and moving in graphic is correct in visual.

for example :
in a mmorpg, a player who didn't cheat will move correctly in the server and other's client, and a player who cheated can only sink his character into the wall but can't walk through the wall, both in the server and other players' client.

what's the common methods to achieve this ? or maybe there's some new tricks ?
thanks~

[chunky]

Gaffer of "Fix your timestep" fame also had an article about this:
http://www.gaffer.org/game-physics/networked-physics

Gary (-;