Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
Erik Nygren <erik+ietf@nygren.org> Sat, 15 May 2021 15:00 UTC
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References: <F4CE48A1-7AB0-45D0-97FF-158CE3A04EE1@icann.org> <3EE971EE-0777-44D6-9CD2-771B92FFE938@hopcount.ca> <1d822219-8ab9-2cb7-d0a4-9b8afc39058d@powerdns.com> <2952D408-117B-40D0-B859-7A8E4111629E@hopcount.ca> <CAHbrMsD+uiaYQ8i58VRjF=3AtW9uAoAtgbKzNzrPZC3QCmD2pQ@mail.gmail.com> <CAH1iCirykCpqkQEizYUBYMJEXMYRGkWvnzyo-jP=XOT-4fP-EA@mail.gmail.com> <123fd984-a3e1-0d09-b745-9a7ed6260759@nic.cz> <CAHbrMsCrf8GS3N=HF53X-M0oq09yw_vKGFLU_qA6wt94-+vNXg@mail.gmail.com> <346afc4d-f8c2-7a2b-e606-344e15230e61@nic.cz> <6782960c9c8f84e1df330d6ddf4d2cfaa7b5d7a7.camel@powerdns.com> <CAMOjQcEHf0=nes+PGZWi7=18u_N5WaS7=i4Sd-9d+9+_BEypFA@mail.gmail.com> <CAH1iCirr9MhZ7LYkmsvihCdSCQmMfuWwn0beZX_CVr62RGnQGg@mail.gmail.com>
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From: Erik Nygren <erik+ietf@nygren.org>
Date: Sat, 15 May 2021 11:00:38 -0400
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To: Brian Dickson <brian.peter.dickson@gmail.com>
Cc: Eric Orth <ericorth=40google.com@dmarc.ietf.org>, dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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On Wed, May 12, 2021 at 4:44 PM Brian Dickson <brian.peter.dickson@gmail.com> wrote: > > Having multiple AliasMode records within an RRset (with either the same or > different Priority) would provide an avenue for dealing with resolution > failure - which is one of the main reasons for any CDN customer to use > multiple CDNs, i.e. to avoid single points of failure (which includes the > DNS component of the CDN). > > I think it would be reasonable to restrict the handling of SVCB processing > to allow multiple AliasMode records in a single RRset in the resolution of > SVCB, i.e. once a branch has been reached, follow the preferred branch > using the existing logic, and either abandon the other branch after the > first successful step in the resolution of the preferred branch, or > alternatively holding the entry point to the second branch (as a backup) > until the first branch's resolution has succeeded to the point of returning > ServiceMode records (and if resolution failure occurs before that point, > switching to the next branch). > This would be the equivalent to keeping a simple list, rather than needed > to handle full recursion tree-walking logic. > > This is a suggestion only, but I think it has merit. > The current examples of "juggling CNAMEs" isn't really practical, > especially given TTLs on CNAMEs. > Having multiple RRs in an RRSET with various Priority values achieves the > equivalent function without requiring the domain owner to engage in active > management of DNS records. The latter approach is at best naive, at worst > harmful to deployment and use of SVCB in the real world. > A question would be whether this adds more to client complexity than even advanced clients would be willing to implement. Multiple Alias records pointing to independent CDNs is only useful if clients pop all the way back to that point to try another tree in the case where connecting to the services at the end of the first Alias record path fails. This also only covers a small number of the "juggling CNAMEs" multi-CDN setups today. Many/most seem to take factors of cost, geographic location, and performance into account, so multiple Alias records wouldn't solve this but would just add another place for more complexity. Erik
- [DNSOP] I-D Action: draft-ietf-dnsop-svcb-https-0… internet-drafts
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Petr Špaček
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tom
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Peter van Dijk
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Stephen Farrell
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- [DNSOP] ZONEMD was Re: [Ext] I-D Action: draft-ie… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Vladimír Čunát
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draf… Wessels, Duane
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draf… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Peter van Dijk
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- [DNSOP] Sub-field encoding scheme discussion (pos… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz