[181210] in North American Network Operators' Group
Re: Anycast provider for SMTP?
daemon@ATHENA.MIT.EDU (=?utf-8?Q?Jonas_Bj=C3=B6rk?=)
Thu Jun 18 17:42:31 2015
X-Original-To: nanog@nanog.org
From: =?utf-8?Q?Jonas_Bj=C3=B6rk?= <mr.jonas.bjork@me.com>
Date: Thu, 18 Jun 2015 23:40:29 +0200
In-reply-to: <55833838.3030300@cox.net>
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> On Jun 18, 2015, at 11:29 PM, Larry Sheldon <larrysheldon@cox.net> wrote:
>=20
>> On 6/18/2015 16:25, Jonas Bj=C3=B6rk wrote:
>>=20
>>> Because clients will switch to unicast for renewal. Also clients will st=
ay
>>> with the current server forever, so you might have a bad distribution of=
>>> load between the servers. If one server was down everyone will switch to=
>>> the other and never go back until forced.
>>=20
>> Why wouldn't they go back to the nearest server when it comes back online=
?
>=20
> Been awhile, but it seems like they try to "renew" the lease they have, wi=
th the server that holds it.
>=20
> --=20
> sed quis custodiet ipsos custodes? (Juvenal)
The clients speak unicast with one single ip-helper which address is shared b=
y all the servers.
They can't choose which ever server to talk to.=
