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X-Original-To: nanog@nanog.org X-Really-To: <nanog@nanog.org> In-Reply-To: <CAO0-hXZKU2gSt3vqj_p0B85xH=yt6RwXJfh_EY9HTzhygnj0Rg@mail.gmail.com> From: William Herrin <bill@herrin.us> Date: Mon, 15 Jun 2015 14:09:11 -0400 To: Joe Hamelin <joe@nethead.com> Cc: NANOG list <nanog@nanog.org> Errors-To: nanog-bounces@nanog.org On Mon, Jun 15, 2015 at 1:50 PM, Joe Hamelin <joe@nethead.com> wrote: > My solution will be to place a load balancer in a hosting site > (virtual, of course) and have it provide HA. But what about HA for the > LB? At first glance anycasting would seem to be a great idea but there is > a problem of broken sessions when routes change. > > Have any of you seen something like this work in the wild? Anycast + TCP = much pain, for reasons which should be obvious. It's on the near side of impossible, but the far side of impractical. You'd spend a lot of money with some high-price software developers getting it to work. > I have a mail system where there are two MX hosts, one in the US and one in > Europe. Both have a DNS MX record metric of 10 so a bastardized > round-robin takes place. This does not work so well when one site goes > down. Not sure why you'd have problems with this since it's a primary operating mode that SMTP was explicitly designed for. Can you elaborate on the kinds of trouble you've experienced? Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
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