Re: [Asrg] overloading server names doesn't work, was who has the message
"John R Levine" <johnl@taugh.com> Tue, 09 February 2010 16:39 UTC
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From: John R Levine <johnl@taugh.com>
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Subject: Re: [Asrg] overloading server names doesn't work, was who has the message
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>>>> mail.btinternet.com. 600 IN CNAME pop-smtp.bt.mail.yahoo.com. >>>> pop-smtp.bt.mail.yahoo.com. 1800 IN CNAME pop-smtp.bt.mail.fy5.b.yahoo.com. >>>> pop-smtp.bt.mail.fy5.b.yahoo.com. 300 IN A 217.12.13.134 >>>> pop-smtp.bt.mail.fy5.b.yahoo.com. 300 IN A 217.146.188.192 >>> >>> I don't hack DNS records enought to be sure, but it appears to need >>> exactly one new record: >>> >>> _report.pop-smtp.bt.mail.fy5.b.yahoo.com IN TXT abuse-report@yahoo.com >> >> Nope, that won't work. CNAMEs don't do a partial match. > Then I guess it's lucky I didn't specify one. But you did. The CNAME only matches its exact name, and doesen't do a partial match of names below it. RFC 2181 explains this, albeit not very clearly. DNAME does what you think CNAME does, but almost nobody implements it because the record synthesis it requires is so complex. >>> _report.pop-smtp.bt.mail.fy5.b.yahoo.com IN TXT abuse-report@yahoo.com >>> _report.pop-smtp.bt.mail.yahoo.com IN TXT abuse-report@yahoo.com >>> _report.mail.btinternet.com IN TXT abuse-report@yahoo.com >> >> That won't work, either. You can't have DNS records below a CNAME. > > I'm not finding where that restriction specified among the list of > restrictions I can find, and apparently all of popular the summaries written > about CNames have missed it too. > > Please cite the standards text that specifies it. Also 2181. I'll go see if there's a clearer explanation somewhere else. Regards, John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY "I dropped the toothpaste", said Tom, crestfallenly.
- [Asrg] Iteration #3. Chris Lewis
- Re: [Asrg] Iteration #3. Dave CROCKER
- Re: [Asrg] Iteration #3. Steve Atkins
- Re: [Asrg] Iteration #3. Chris Lewis
- Re: [Asrg] Iteration #3. Derek Diget
- Re: [Asrg] Iteration #3. Alessandro Vesely
- Re: [Asrg] Iteration #3. Chris Lewis
- Re: [Asrg] Iteration #3. Chris Lewis
- [Asrg] Consensus Call - submission via posting (w… Dave CROCKER
- Re: [Asrg] Consensus Call - submission via postin… Lyndon Nerenberg (VE6BBM/VE7TFX)
- Re: [Asrg] Consensus Call - submission via postin… Chris Lewis
- Re: [Asrg] Consensus Call - submission via postin… Steve Atkins
- Re: [Asrg] Consensus Call - submission via postin… Dave CROCKER
- Re: [Asrg] Consensus Call - submission via postin… Dotzero
- Re: [Asrg] Iteration #3. Derek Diget
- Re: [Asrg] Consensus Call - submission via postin… Derek Diget
- Re: [Asrg] Consensus Call - submission via postin… Bart Schaefer
- Re: [Asrg] Consensus Call - submission via postin… Alessandro Vesely
- Re: [Asrg] Iteration #3. Alessandro Vesely
- Re: [Asrg] Iteration #3. Daniel Feenberg
- Re: [Asrg] Iteration #3. John Levine
- Re: [Asrg] Iteration #3. Daniel Feenberg
- Re: [Asrg] Iteration #3. Dave CROCKER
- Re: [Asrg] Iteration #3. John Levine
- Re: [Asrg] Iteration #3. Dave CROCKER
- Re: [Asrg] Consensus Call - submission via postin… Ian Eiloart
- Re: [Asrg] Consensus Call - submission via postin… John Levine
- Re: [Asrg] Consensus Call - submission via postin… BOBOTEK, ALEX (ATTCINW)
- Re: [Asrg] Consensus Call - submission via postin… Andrew Richards
- [Asrg] who has the message (was Re: Consensus Cal… Dave CROCKER
- Re: [Asrg] Consensus Call - submission via postin… Chris Lewis
- Re: [Asrg] Consensus Call - submission via postin… Andrew Richards
- Re: [Asrg] who has the message (was Re: Consensus… Andrew Richards
- Re: [Asrg] who has the message (was Re: Consensus… Dave CROCKER
- Re: [Asrg] who has the message (was Re: Consensus… Chris Lewis
- Re: [Asrg] who has the message (was Re: Consensus… John Levine
- Re: [Asrg] who has the message (was Re: Consensus… Dave CROCKER
- Re: [Asrg] overloading server names doesn't work,… John R Levine
- Re: [Asrg] Consensus Call - submission via postin… Bill Cole
- Re: [Asrg] overloading server names doesn't work,… Daniel Feenberg
- Re: [Asrg] who has the message (was Re: Consensus… Ian Eiloart
- Re: [Asrg] Consensus Call - submission via postin… Ian Eiloart
- Re: [Asrg] who has the message (was Re: Consensus… Ian Eiloart
- Re: [Asrg] who has the message (was Re: Consensus… Andrew Richards
- Re: [Asrg] who has the message (was Re: Consensus… Andrew Richards
- Re: [Asrg] who has the message (was Re: Consensus… Ian Eiloart
- Re: [Asrg] who has the message (was Re: Consensus… Andrew Richards
- Re: [Asrg] who has the message (was Re: Consensus… Ian Eiloart
- Re: [Asrg] overloading server names doesn't work,… Dave CROCKER
- Re: [Asrg] who has the message (was Re: Consensus… Paul Russell
- Re: [Asrg] overloading server names doesn't work,… John R Levine
- Re: [Asrg] overloading server names doesn't work,… Dave CROCKER
- Re: [Asrg] DNS basics, was overloading server nam… John R Levine
- Re: [Asrg] Consensus Call - submission via postin… Andrew Richards
- Re: [Asrg] Consensus Call - submission via postin… Ian Eiloart
- Re: [Asrg] DNS basics, was overloading server nam… Dave CROCKER
- Re: [Asrg] DNS basics, was overloading server nam… John R Levine
- Re: [Asrg] Consensus Call - submission via postin… Jose-Marcio Martins da Cruz
- Re: [Asrg] DNS basics, was overloading server nam… Douglas Otis
- Re: [Asrg] Consensus Call - submission via postin… Ian Eiloart
- Re: [Asrg] Consensus Call - submission via postin… Jose-Marcio Martins da Cruz