Academic question (at the moment):
Is it possible to advertise BGP routes to a given prefix (IPv6 and/or IPv4) from multiple different physical data centers?
I guess this is multi-homing, but different. Conventional multi-homing means a single data center with multiple links. This would be multiple different geographically distributed data centers.
The desired behavior would be this: if a user in Asia accesses one of these IPs, their packets will probably end up at the Asian data center. Meanwhile if a user in the USA sends a packet to one of these IPs, their packet will instead be routed to a USA data center. And so on. Same IP, but the network should tend to route packets to the closest site.
Is this possible on the current Internet? Is it possible with IPv6, IPv4, or both? (I suspect you'd have to own your own block and advertise your own BGP routes or contract with a chain of data centers to do this...)