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Re: Localized mail servers, global scope
On 2005-06-23, at 10:57, Suresh Ramasubramanian wrote:
I know of people who have anycasted the address used by their clients for mail submission using SMTP (so that clients connect to a stable address, and the node which services their request varies according to where they are connecting from).Wild idea and there's just too much good german beer here at MAAWG (www.maawg.org) in Dusseldorf, but .. anybody tried anycasting a mailserver? Operationally that is ...
Like all applications of service distribution using anycast, care is required: e.g. a stable, internal network with a well-known topology, and anycast nodes placed such that node selection by clients is consistent, packet-to-packet, for periods of time far exceeding the expected maximum transaction time.
The places I have seen this done have had POPs connected with expensive and congested links, so keeping mail submission from customers local and snappy was a big win.
I think you're talking about anycasting a server across the Internet to act as a low-numbered MX, though. I haven't met anybody who thought that was a good idea, yet. :-)