Re: [DNSOP] abandoning ANAME and standardizing CNAME at apex
Mukund Sivaraman <muks@mukund.org> Wed, 19 September 2018 08:20 UTC
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Date: Wed, 19 Sep 2018 13:49:54 +0530
From: Mukund Sivaraman <muks@mukund.org>
To: Petr Špaček <petr.spacek@nic.cz>
Cc: dnsop@ietf.org
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Subject: Re: [DNSOP] abandoning ANAME and standardizing CNAME at apex
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On Wed, Sep 19, 2018 at 09:48:18AM +0200, Petr Špaček wrote: > > > On 19/09/2018 09:31, Mukund Sivaraman wrote: > > On Wed, Sep 19, 2018 at 09:05:21AM +0200, Petr Špaček wrote: > >> On 18/09/2018 22:02, JW wrote: > >>> > >>> -------- Original message -------- > >>> From: Mark Andrews <marka@isc.org> > >>> > >>>> I would also expect a relatively large client population using SRV records > >>>> given the rate Firefox and Chrome browsers are upgraded. SRV lookups > >>>> work for lots ofother protocols. SRV records also make it through > >>>> firewalls and IDS today. > >>>> > >>> > >>> Hi Mark, > >>> > >>> I agree SRV is the obvious choice for a greenfield protocol but there is > >>> HTTP code sprinkled /everywhere/. I can't imagine all those forgotten > >>> scripts, lonely IOT devices, and troubleshooting guides are going to be > >>> as easy to solve as updating chrome and firefox. > >>> > >>> Whatever the solution, I feel it should be as transparent to the client > >>> as possible. CNAME would fit this bill but the negative impact is > >>> largely unknown. > >> > >> TL;DR: Experiments with CNAME @ apex showed that it is not going to work > >> if the domain has e.g. MX records for e-mail. > >> > >> Ondrej Sury describes his experimental results in presentation here: > >> https://github.com/IETF-Hackathon/ietf102-project-presentations/blob/master/dns_hackathon-presentation.pdf > > > > Aren't these results with current state of implementations? A cached > > CNAME is expected to be matched against future type queries when > > following RFC 1034/1035 behavior. > > > > A change in behavior where resolvers expect that CNAME (as a fallback > > type) will co-exist with other types will work properly. > > Well, I started this thread because I naively thought that we can get > away with *current* behavior which kind of works because of various > non-standard workarounds. Experiment above proved me wrong so this seems > like dead-end to me - it will have similar upgrade problem as any other > new mechanism. That's fair, but it would have lower implementation complexity which is my concern. I much prefer SRV (that Mark's been pushing for several years now) that is simpler and elegant. A relaxed fallback-CNAME resolver implementation would not break the DNS, so IMO that proposal should still be carried through so some X years later most deployed resolvers will be capable of handling it. Mukund
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Joe Abley
- Re: [DNSOP] faux BNAME, was abandoning ANAME and … John Levine
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… John Levine
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Jan Včelák
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Ebersman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… David Conrad
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ondřej Surý
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Wouters
- Re: [DNSOP] abandoning ANAME and standardizing CN… Matthew Pounsett
- Re: [DNSOP] abandoning ANAME and standardizing CN… Joe Abley
- Re: [DNSOP] abandoning ANAME and standardizing CN… John Levine
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Colm MacCárthaigh
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Anthony Eden
- Re: [DNSOP] abandoning ANAME and standardizing CN… Erik Nygren
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Jared Mauch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Wouters
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Joe Abley
- Re: [DNSOP] abandoning ANAME and standardizing CN… Lanlan Pan
- Re: [DNSOP] abandoning ANAME and standardizing CN… tjw ietf
- Re: [DNSOP] abandoning ANAME and standardizing CN… Colm MacCárthaigh
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- [DNSOP] abandoning ANAME and standardizing CNAME … Petr Špaček
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Viktor Dukhovni
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Joe Abley
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Shumon Huque
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Joe Abley
- Re: [DNSOP] abandoning ANAME and standardizing CN… Viktor Dukhovni
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… 神明達哉
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Shumon Huque
- Re: [DNSOP] abandoning ANAME and standardizing CN… Warren Kumari
- Re: [DNSOP] abandoning ANAME and standardizing CN… John R Levine
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Lanlan Pan
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… John R Levine
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Warren Kumari
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] Creating a query/record for A and AAAA Paul Vixie
- Re: [DNSOP] Creating a query/record for A and AAAA Michael Sheldon
- Re: [DNSOP] Creating a query/record for A and AAAA Paul Vixie
- [DNSOP] Creating a query/record for A and AAAA Michael Sheldon
- Re: [DNSOP] Creating a query/record for A and AAAA Paul Wouters
- Re: [DNSOP] Creating a query/record for A and AAAA Mark Andrews
- Re: [DNSOP] Creating a query/record for A and AAAA Tony Finch
- Re: [DNSOP] Creating a query/record for A and AAAA Ondřej Surý
- Re: [DNSOP] Creating a query/record for A and AAAA Jared Mauch
- Re: [DNSOP] Creating a query/record for A and AAAA Paul Wouters
- Re: [DNSOP] Creating a query/record for A and AAAA Ray Bellis
- Re: [DNSOP] Creating a query/record for A and AAAA Ray Bellis
- Re: [DNSOP] Creating a query/record for A and AAAA Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tim Wicinski
- Re: [DNSOP] abandoning ANAME and standardizing CN… Brian Dickson
- Re: [DNSOP] abandoning ANAME and standardizing CN… Tony Finch
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Hoffman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Matthijs Mekking
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Paul Vixie
- Re: [DNSOP] abandoning ANAME and standardizing CN… Dan York
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Stephane Bortzmeyer
- Re: [DNSOP] abandoning ANAME and standardizing CN… Stephane Bortzmeyer
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Ray Bellis
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Petr Špaček
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Evan Hunt
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… JW
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… Petr Špaček
- Re: [DNSOP] abandoning ANAME and standardizing CN… Stephane Bortzmeyer
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mark Andrews
- Re: [DNSOP] abandoning ANAME and standardizing CN… Petr Špaček
- Re: [DNSOP] abandoning ANAME and standardizing CN… Mukund Sivaraman