Re: [DNSOP] Clarifying referrals (#35)
Paul Vixie <paul@redbarn.org> Mon, 13 November 2017 19:28 UTC
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Date: Mon, 13 Nov 2017 11:28:43 -0800
From: Paul Vixie <paul@redbarn.org>
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To: Matthew Pounsett <matt@conundrum.com>
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References: <20171112075445.tf2ut5dxzhhnqe7l@mx4.yitter.info> <20171112131831.GA32208@laperouse.bortzmeyer.org> <20171113014445.ncldrwnuuvluecx7@mx4.yitter.info> <5A08FD96.8030907@redbarn.org> <20171113020736.ga7rzgst2hurb56h@mx4.yitter.info> <5A09068A.3030206@redbarn.org> <c66000fbd9174916a1142650298c7632@XCASPRD01-DFT.dpu.depaul.edu> <20171113085235.2fddd72a@p50.localdomain> <CAAiTEH_ikmAryaAXbKxVBHODfJx4Vohb7XWUPnqGw9s41ZR_Bg@mail.gmail.com> <5A09EAA6.5010305@redbarn.org> <CAAiTEH_U6eSZhSHbztwKF0xvem2e6PENG34JftGGmizdsAJJpg@mail.gmail.com>
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Subject: Re: [DNSOP] Clarifying referrals (#35)
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Matthew Pounsett wrote: > > > On 13 November 2017 at 10:55, Paul Vixie <paul@redbarn.org > <mailto:paul@redbarn.org>> wrote: > > > why is this nor a broken configuration? > > > It's my understanding that SERVFAIL indicates that the server sending > the RCODE–or in the case of a recursive response, the upstream > authoritative server–has a broken configuration. I don't believe > SERVFAIL indicates "you followed a lame delegation." As far as I'm > aware, we don't have a clearly defined signal for that, which is why > many implementations chose to use REFUSED in that case. someone asking you an RD=0 question about a zone you're not authoritative for indicates a misconfiguration somewhere. this is what SERVFAIL is for, because at the signalling level, it tells the client that no possible query about that name can succeed, and it ought to stop sending questions like that to this server. it's no different in principle from "i'm out of disk space, so i can't fetch the zone, so even though i'm supposed to be a secondary, i can't do it right now." > > http://www.circleid.com/posts/20120111_refusing_refused_for_sopa_pipa/ > > I haven't got the time this morning to search release notes, but I'm > fairly sure that in 2012, when you wrote that article, current versions > of BIND were already handing out REFUSED to indicate "I'm not > authoritative for that." At the very least it began doing that not long > after. the implication of REFUSED is that if someone else asked this question, we might be able to answer. so if BIND is doing what you say, it's wrong. > ... If that were a problem, given BIND's market share, we should be > seeing widespread brokenness, but I don't think we are–none that's > making it from my support department to me or to our hostmaster@ > accounts, at any rate. yikes! you remind me of the guy who said on nanog a few years back that since he wasn't seeing spoofed-source ddos attacks any more, we should all stop worrying about them. your lived experience can be cause for concern, but never for complacency. -- P Vixie
- [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Stephane Bortzmeyer
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) John Kristoff
- Re: [DNSOP] [Ext] Re: Clarifying referrals (#35) Edward Lewis
- [DNSOP] CDS polling, was Re: [Ext] Re: Clarifying… Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Evan Hunt
- Re: [DNSOP] Clarifying referrals (#35) Matthew Pounsett
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Edward Lewis
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Matthew Pounsett
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Matthew Pounsett
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Robert Edmonds
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Mark Andrews
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Evan Hunt
- [DNSOP] another draft (was Re: Clarifying referra… Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Mark Elkins
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Jacques Latour
- Re: [DNSOP] Clarifying referrals (#35) Dave Lawrence
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Paul Wouters
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] CDS polling, was Re: [Ext] Re: Clarif… Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Stephane Bortzmeyer
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) P Vix
- Re: [DNSOP] Clarifying referrals (#35) Mark Andrews
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) P Vix
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Paul Hoffman
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] Clarifying referrals (#35) Dick Franks
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Dick Franks
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Dick Franks
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Paul Vixie
- Re: [DNSOP] Clarifying referrals (#35) Florian Weimer
- Re: [DNSOP] Clarifying referrals (#35) Tony Finch
- Re: [DNSOP] Clarifying referrals (#35) Andrew Sullivan
- Re: [DNSOP] Clarifying referrals (#35) Bob Harold
- Re: [DNSOP] Clarifying referrals (#35) Evan Hunt
- Re: [DNSOP] Clarifying referrals (#35) Wessels, Duane
- Re: [DNSOP] Clarifying referrals (#35) Johannes Naab