nanog mailing list archives
Re: DNS hostnames with a duplicate CNAME and A record - which should be removed?
From: William Herrin <bill () herrin us>
Date: Wed, 17 Oct 2012 16:00:49 -0400
On Wed, Oct 17, 2012 at 3:25 PM, Landon Stewart <lstewart () superb net> wrote:
The problem is that we have some zones that have records with the same 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? I'm inclined to say that the CNAME should be removed in all these cases but I can't find any definitive information on this and after doing some tests it doesn't always seem straightforward.
If you have a CNAME record for a particular name, you should not have any other record of any type for that same name. Which you should remove depends on the details of the particular circumstance. If you really mean "identical to that other name with respect to all records and record types" then there's nothing inherently wrong with the CNAME. If you don't, then you shouldn't use a CNAME there. Regards, Bill Herrin -- William D. Herrin ................ herrin () dirtside com bill () herrin us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
Current thread:
- DNS hostnames with a duplicate CNAME and A record - which should be removed? Landon Stewart (Oct 17)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? Andrew Sullivan (Oct 17)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? William Herrin (Oct 17)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? Tony Finch (Oct 18)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? jeff weisberg (Oct 18)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? Landon Stewart (Oct 18)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? Jimmy Hess (Oct 19)
- Re: DNS hostnames with a duplicate CNAME and A record - which should be removed? Masataka Ohta (Oct 19)