Re: DNS hostnames with a duplicate CNAME and A record - which should be removed?

On Wed, Oct 17, 2012 at 12:25:49PM -0700, Landon Stewart wrote:

hostname that have both a CNAME as well as an A record, MX record, SOA record and/or NS record. Is there an easy answer for what should be removed?

"You should remove the one that you don't need." A CNAME may not be at the same owner name as any other RR. If you need an alias, then you want a CNAME. If you need some other record, you need not to have a CNAME. If you think about what a CNAME is, it is obvious that it can't exist at the same name as any other RR, because it says "this name is actually that name over there".

Should the CNAME just get nuked in all of these cases?

Probably. A -- Andrew Sullivan Dyn Labs asullivan@dyn.com