Just wanted to thank everyone who replied to my question on the list and off-list. Cheers, Jeff On Tue, Apr 5, 2011 at 12:31 PM, Paul W. Roach III <paul@isaroach.com>wrote:

The downside of anycast for TCP services require state to be replicated in realtime across all app servers to prevent crappy user experience in the case where I switch servers mid-transaction.

On Tue, Apr 5, 2011 at 3:17 PM, Jack Carrozzo <jack@crepinc.com> wrote:

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Anycast works.

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how to 1) ensure clients are routed to the closest geographical server

[...] we are looking for ideas on 2)

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ensure the client hits the server(s) with the shortest path.

No need to deal with that yourself when BGP eats that problem for breakfast lunch and dinner.

-Jack Carrozzo