mailop> Probably, this question is from misunderstanding on how DNS mailop> round-robin works.
More fundamentally, it's because DNS round robin doesn't exist in the protocol. If you ask for an FQDN and RRtype, you get all records, no guarantee it will or won't be in the same order every time. And if the server doesn't give the same complete answer every time (regardless of order), it's technically violating the DNS RFCs. Yes, I know that BIND and other auth servers and various fully recursive servers and stub servers can all potentially do something that looks like random round robin. The point is that you can't ever count on every DNS server or client in the whole DNS resolution chain from initial query to final answer doing the same thing because there is no RFC specifying round robin. That means that if you're wishing and hoping that round robin will work for you, also count on a certain percentage of failures all the time. Or bite the bullet and get a commercial load balancer and experience a completely different set of pain/brokenness. ;) _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
