Re: [DNSOP] Some distinctions and a request - Have some class?
Ray Bellis <ray@bellis.me.uk> Sun, 05 July 2015 07:17 UTC
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Date: Sun, 05 Jul 2015 08:17:03 +0100
From: Ray Bellis <ray@bellis.me.uk>
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To: Andrew Sullivan <ajs@anvilwalrusden.com>
References: <6CB05D82CE245B4083BBF3B97E2ED470C2759F@ait-pex01mbx01.win.dtu.dk> <6CB05D82CE245B4083BBF3B97E2ED470C275B2@ait-pex01mbx01.win.dtu.dk> <E225C721-7279-4053-97A2-2D63A155DA14@karoshi.com> <6CB05D82CE245B4083BBF3B97E2ED470C27602@ait-pex01mbx01.win.dtu.dk> <88E49F4B-64BD-4832-BD02-D1A882874E92@karoshi.com> <20150702234423.GB23022@mycre.ws> <EBDBDD70-046F-4E31-BDAC-A619EECD4F13@karoshi.com> <20150703012146.GA29948@mycre.ws> <DC13E07F-2203-4FE9-A67F-B5851A54298F@karoshi.com> <986E07DA-B174-4F81-BFB5-F5EAD46C506F@karoshi.com> <20150705003514.GD48722@mx2.yitter.info>
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Subject: Re: [DNSOP] Some distinctions and a request - Have some class?
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On 05/07/2015 01:35, Andrew Sullivan wrote: > Classes don't work in the general case, because CNAME (and following > it, DNAME) is class-independent. This is arguably a bug in the > protocol, but it's a fact nevertheless. As a result, different > classes aren't really different namespaces. Andrew, Can you please elaborate on what you mean there? Sure, CNAME is *defined* for all classes, but AFAIK there's no way to "jump" out of one class into another using a CNAME. If you've queried in class FOO and see a CNAME then the resolution of the target of the CNAME should continue in class FOO. RFC 1034 §3.6.2: "CNAME RRs cause special action in DNS software. When a name server fails to find a desired RR in the resource set associated with the domain name, it checks to see if the resource set consists of a CNAME record with a matching class. If so, the name server includes the CNAME record in the response and restarts the query at the domain name specified in the data field of the CNAME record." kind regards, Ray
- Re: [DNSOP] back to: Some distinctions and a requ… Hugo Maxwell Connery
- Re: [DNSOP] back to: Some distinctions and a requ… Edward Lewis
- Re: [DNSOP] back to: Some distinctions and a requ… Hugo Maxwell Connery
- Re: [DNSOP] back to: Some distinctions and a requ… manning
- Re: [DNSOP] back to: Some distinctions and a requ… Hugo Maxwell Connery
- Re: [DNSOP] back to: Some distinctions and a requ… manning
- Re: [DNSOP] back to: Some distinctions and a requ… Paul Vixie
- Re: [DNSOP] back to: Some distinctions and a requ… Edward Lewis
- Re: [DNSOP] back to: Some distinctions and a requ… Edward Lewis
- Re: [DNSOP] back to: Some distinctions and a requ… Mark Andrews
- Re: [DNSOP] back to: Some distinctions and a requ… Andrew Sullivan
- Re: [DNSOP] back to: Some distinctions and a requ… manning
- Re: [DNSOP] back to: Some distinctions and a requ… Robert Edmonds
- Re: [DNSOP] back to: Some distinctions and a requ… manning
- Re: [DNSOP] back to: Some distinctions and a requ… Robert Edmonds
- Re: [DNSOP] back to: Some distinctions and a requ… manning
- Re: [DNSOP] back to: Some distinctions and a requ… Robert Edmonds
- Re: [DNSOP] back to: Some distinctions and a requ… manning
- Re: [DNSOP] Some distinctions and a request - Hav… manning
- Re: [DNSOP] Some distinctions and a request - Hav… Warren Kumari
- Re: [DNSOP] Some distinctions and a request - Hav… manning
- Re: [DNSOP] Some distinctions and a request - Hav… Patrik Fältström
- Re: [DNSOP] Some distinctions and a request - Hav… Hugo Maxwell Connery
- Re: [DNSOP] Some distinctions and a request - Hav… manning
- Re: [DNSOP] Some distinctions and a request - Hav… joel jaeggli
- Re: [DNSOP] Some distinctions and a request - Hav… Suzanne Woolf
- Re: [DNSOP] Some distinctions and a request - Hav… manning
- Re: [DNSOP] Some distinctions and a request - Hav… Warren Kumari
- Re: [DNSOP] Some distinctions and a request - Hav… Patrik Fältström
- Re: [DNSOP] Some distinctions and a request - Hav… manning
- Re: [DNSOP] Some distinctions and a request - Hav… Paul Ferguson
- Re: [DNSOP] Some distinctions and a request - Hav… John Levine
- Re: [DNSOP] Some distinctions and a request - Hav… Patrik Fältström
- Re: [DNSOP] Some distinctions and a request - Hav… Patrik Fältström
- Re: [DNSOP] Some distinctions and a request - Hav… Steve Crocker
- Re: [DNSOP] Some distinctions and a request - Hav… Suzanne Woolf
- Re: [DNSOP] Some distinctions and a request - Hav… Patrik Fältström
- Re: [DNSOP] Some distinctions and a request - Hav… Andrew Sullivan
- [DNSOP] Top level names -- precision re categorie… Steve Crocker
- Re: [DNSOP] Some distinctions and a request - Hav… John R Levine
- Re: [DNSOP] Some distinctions and a request - Hav… Ray Bellis
- Re: [DNSOP] Some distinctions and a request - Hav… Stephane Bortzmeyer
- Re: [DNSOP] Some distinctions and a request - Hav… Steve Crocker
- Re: [DNSOP] Some distinctions and a request - Hav… P Vixie
- Re: [DNSOP] Some distinctions and a request - Hav… P Vixie
- Re: [DNSOP] Some distinctions and a request - Hav… Steve Crocker
- Re: [DNSOP] Some distinctions and a request - Hav… Stephane Bortzmeyer
- Re: [DNSOP] Some distinctions and a request - Hav… Andrew Sullivan
- Re: [DNSOP] Some distinctions and a request - Hav… Evan Hunt
- Re: [DNSOP] Some distinctions and a request - Hav… Ray Bellis
- Re: [DNSOP] Some distinctions and a request - Hav… Andrew Sullivan
- Re: [DNSOP] Some distinctions and a request - Hav… manning
- Re: [DNSOP] Some distinctions and a request - Hav… Evan Hunt
- Re: [DNSOP] Some distinctions and a request - Hav… Andrew Sullivan
- Re: [DNSOP] Top level names -- precision re categ… Jaap Akkerhuis
- Re: [DNSOP] Top level names -- precision re categ… Steve Crocker