Originally Posted by TOM_RUS
Also UnitGUID is completely unreliable for NPC's:
I'm getting 1129 (Agamaggan-US, host for connection?) for "player" (self) on Archimonde-US, but NPC's have realmid 74, I also saw a player with realmid 74 (and he was from Black Dragonflight) that doesn't seems to connected to Archimonde. Also saw another player from Gul'Dan with realmid 74 in guid. May be human starter zone for Archimonde-US is hosted by Skullcrusher-US (74)? Because otherwise all of this doesn't make any sense.
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Using UnitGUID for server tracking only makes sense for player tracking.
UnitGUID of game assets I expect will always be associated with the server on startup.
We don't know the algorithm that Blizzard uses to decide which Server is the active server when a cross-realm zone is encountered.
While we might think that a single realm would always move to a connected realm that doesn't need to be true.
In the example given above possibly server 74 was the busier one and 1129 processing moved to that one. Tomorrow it might be the other way around.