Re: Anycast provider for SMTP?

[Bill Woodcock <woody () pch net>]

> On Jun 18, 2015, at 10:19 PM, James Hartig <fastest963 () gmail com> wrote:
> Just curious, how does DNS load balancing work if people are using
> 8.8.8.8/208.67.222.222 or basically any public resolvers that cache and
> have a significant (relatively speaking) user-base? Is the actual percent
> of requests so small that it doesn't matter?

The percent of requests is significant, but OpenDNS and Google and the other significant open resolvers are, 
themselves, anycast, so the geographic correlation is preserved.  Also, there’s an RFC for passing an origin IP tag 
along to the authoritative server, but I don’t know if anyone’s actually doing anything with that on any global 
inter-provider scale.

                                -Bill

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