Round robin DNS and only one record?

Kevin Darcy kcd at
Tue Dec 9 20:44:42 UTC 2008

Dustin Lovell wrote:
> Certain browsers hitting our web application don't like having two A-records handed to them (I'm still in the process of figuring out why), 

Yeah, you really need to dig into that further, since we have *hundreds* 
of multi-A-record names, and we've never run into any browser problems 
because of it.

Misdiagnosis perhaps?

Now, it _is_ true that some browsers take a noticeably -- and thus 
perhaps unacceptably -- long time to fail over from one address to 
another, when given a multi-A-record DNS response and the first address, 
or the first _n_ addresses, are unreachable. But if all of the addresses 
are reachable, I'm not aware of any browsers that have an issue with 
multi-A-record DNS responses _per_se_. They are extremely common.

- Kevin

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