nanog mailing list archives
Re: Performance Issues - PTR Records
From: Jimmy Hess <mysidia () gmail com>
Date: Wed, 2 Nov 2011 21:09:36 -0500
On Wed, Nov 2, 2011 at 8:33 PM, Larry Smith <lesmith () ecsis net> wrote:
On Wed November 2 2011 20:27, Matt Chung wrote:I assumed that the applications would take absent records intoWhen you mis-place your keys do you only look in one place and then give up? The calling server does not know there is "no" record until it exhausts
If the reverse zone is properly configured, but just the PTR record is missing, you get NXDOMAIN, which is not "you mis-place your keys"; it's "someone told you authoritatively that your keys don't exist", never existed or no longer existed. If you ask where your key ring went, and Frodo Baggins informs you that it doesn't exist, because it was tossed down into a pool of magma on mount doom, and you trust his reply, you stop looking for it. The only way you don't trust a valid DNS reply is if you are implementing DNSSEC, and the "authoritative proof of non-existence" doesn't validate -- -JH
Current thread:
- Performance Issues - PTR Records Matt Chung (Nov 02)
- Re: Performance Issues - PTR Records Jeff Walter (Nov 02)
- Re: Performance Issues - PTR Records Ben Jencks (Nov 02)
- Re: Performance Issues - PTR Records PC (Nov 02)
- Re: Performance Issues - PTR Records J (Nov 02)
- Re: Performance Issues - PTR Records Matt Chung (Nov 02)
- Re: Performance Issues - PTR Records Larry Smith (Nov 02)
- Re: Performance Issues - PTR Records Jimmy Hess (Nov 02)
- Re: Performance Issues - PTR Records PC (Nov 02)
- Re: Performance Issues - PTR Records Paul Ebersman (Nov 04)
- Re: Performance Issues - PTR Records Tim Franklin (Nov 04)
- Re: Performance Issues - PTR Records Paul Ebersman (Nov 04)
- Re: Performance Issues - PTR Records Tom Lanyon (Nov 06)
- Re: Performance Issues - PTR Records Mark Andrews (Nov 06)
- Re: Performance Issues - PTR Records Jimmy Hess (Nov 06)
- Re: Performance Issues - PTR Records Robert Bonomi (Nov 06)
- Re: Performance Issues - PTR Records Chris Adams (Nov 06)
- Re: Performance Issues - PTR Records Tom Lanyon (Nov 06)
- Re: Performance Issues - PTR Records Robert Bonomi (Nov 06)