On Mon, 13 Jul 1998, James FitzGibbon wrote:
> Yes, but if the DNS looks like this:
>
> mail.isp.com. IN A 10.1.1.1
> IN A 10.1.1.2
>
> And the machine at 10.1.1.2 goes down, then 50% of the Joe users out there
> will get the IP of a dead machine until DNS is changed or 10.1.1.2 comes
> back up.
The users will get both IP addresses, but in a random order. If they are
running Exim, it will quickly learn that one of the IP addresses is
dead, and will soon not be trying it very often. Exim's retrying data is
held per IP address, not per host name, for precisely this reason.
Of course, there are stupid machines that can't handle more than one IP
address, and these will indeed have trouble.
--
Philip Hazel University Computing Service,
P.Hazel@??? New Museums Site, Cambridge CB2 3QG,
ph10@??? (sic) England. Phone: +44 1223 334714
--
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