Leonard Isham wrote:
On 10/26/05, Benjamin Smith lists@benjamindsmith.com wrote:
On Tuesday 25 October 2005 17:09, Jay Leafey wrote:
The DNS round-robin stuff does a fair job of load balancing but it's not perfect, I'm still looking into alternatives for that.
What do you mean by "not perfect" - it's bad enough that alternatives are needed?
Rpound Robin DNS keeps on handing out the IP addresses even if a system is down/unresponsive.
He's not really using round robin DNS, if he has mx1 *and* mx2 listed with different IP addresses, though they have the same priority.
So if one of the servers goes down, any sane mail system (which seems to exclude qmail in this case - no flamwars please) should try the other MX, if the one which had been chosen first is not reachable, as this is seen as a temporary error.
Sure, if he had only *one* hostname with two IPs, this could be a problem.
Ralph