Multiple A and PTR and the "main" ones?

Mark Andrews marka at
Mon Sep 14 08:22:11 UTC 2015

In message <55F6815C.3030906 at>, Reindl Harald writes:
> Am 14.09.2015 um 07:31 schrieb Harshith Mulky:
> > I could not stop asking the question related to this.
> >
> > I am sorry if this is not relevant to this Topic
> >
> > Is it not possible to send multiple "A"  Records for a same name with
> > different IPs. It might be that the bind might be listening on multiple
> > IPs on same server
> > What would happen if one of the IP interfaces is not reachable?
> the same as when it is a different machine, the client which chose that
> record will fail to connect, dns round-robin is for load-sharing and not
> failover

Properly written clients will failover and failover quickly.  It
isn't hard to write a client that will failover.  RFC 6555 is all
about fast failover when one of the addresses is unreachable.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at

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