dns A RR as failover

Mark Andrews Mark_Andrews at isc.org
Fri Feb 17 11:15:36 UTC 2006

> Hi,
> This question does not concern bind directly, but DNS generally.
> MX records are setup with priorities to create failover servers. That's 
> nice. But could something like that be done with A records?
> Say, if I specify two A records for domain.com, which one will the 
> clients use and what if the first one they tried, fails? I can't specify 
> priorities for them like with MX.
> For example google.com has several A records. How does failover work for 
> A records work in DNS?
> Thanks in advance,
>        Alex

	The DNS has SRV records which are a generalisation of MX.
	It is up to the application / protocol to specify how to
	use them.

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

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