Quote:
how much bandwidth does each "zone" connection to the "World" server need?
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To take you to the letter, very little. Such communication is mainly during client transfer from zone to zone (or from login to zone or back), or for world wide commmunications, like /ooc, ...
Real bandwidth load comes from the mobs (move, spellcasting, ...), in client <->zone comms, and is estimated about 6KBytes per user connected. You get lag when 6 x NbClients comes near to server's upload or download bandwitdh. Even on diff. zones, it still makes about 6K per client.
*nix wont do much better in this case.
There are several other elements in your post, but still i hope this starts to give an answer.