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Warcraft 3 syncronization packets

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Cap_4a

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Cap_4a

Does anyone know how the sync checksum is calculated in W3GS_OUTGOING_KEEPALIVE packet ? This packet is rapidly sent from client to host and if host sees that checksum is wrong it disconnects the client.
 
I am guessing the host does not calculate it, only the clients do. The Host then disconnects players who have non-matching checksums.

These values are usually produced as a function of synchronous/deterministic game state or as a result of a sequence of events (every change to synchronous/deterministic game state changes it in some way).
 
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