Re: [dbound] [DNSOP] Over on the dbound list: draft-dcrocker-dns-perimeter-00
Bob Harold <rharolde@umich.edu> Thu, 04 April 2019 16:58 UTC
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From: Bob Harold <rharolde@umich.edu>
Date: Thu, 04 Apr 2019 12:57:47 -0400
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To: Dave Crocker <dcrocker@bbiw.net>
Cc: dbound@ietf.org
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Subject: Re: [dbound] [DNSOP] Over on the dbound list: draft-dcrocker-dns-perimeter-00
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On Thu, Apr 4, 2019 at 10:54 AM Dave Crocker <dhc@dcrocker.net> wrote: > Bob, > > On 4/4/2019 7:17 AM, Bob Harold wrote: > > I have two questions: > > > > If I want to separate these levels: > > example. > > a.example. > > b.a.example. > > > > Then a.example is both a 'begin' and 'end' node. Do I put in two > > records, one for 'begin' and one for 'end'? > > First, note that Perimeters are actually /between/ node names. So the > above would be: > > > example. > {perimeter} > > a.example. > {perimeter} > > b.a.example. > > Some choices for marking these will depend upon the specific Schema that > is defined. So, for example, I could imagine a Schema that demands an > 'end' above a 'begin' and I could imagine a Scheme that merely requires > either one to be in place, or requires a specific one. > So for a simple hierarchy there might a schema specification might > merely mandate that each perimeter down a hierarchy be marked by a new > 'begin': > > > {perimeter} > > > example. > \ > ._perim TXT begin <schema> > > {perimeter} > > > a.example. > \ > ._perim TXT begin <schema> > > > {perimeter} > > > b.a.example. > \ > ._perim TXT begin <schema> > > > Each _perim record, in the above sequence, for example., is declaring > that there is a Perimeter above the associated DNS node name. > > but yes, the requirement might be for more verbosity: > > > {perimeter} > > > example. > \ > ._perim TXT begin <schema> > ._perim TXT end <schema> > > {perimeter} > > > a.example. > \ > ._perim TXT end <schema> > ._perim TXT begin <schema> > > > {perimeter} > > > b.a.example. > \ > ._perim TXT end <schema> > ._perim TXT begin <schema> > > And my having to write this response makes me suspect there's some > benefit in adding an end-begin shorthand to the specification, to reduce > the verbosity and permit a single record to declares Perimeters both > above and below the node. It's purpose would be for Perimeter hierarchy > have a one-name level, such as your example (and I suspect would be a > common use.) > > Agreed. > > > Secondly, if I have: > > a.example. > > b.a.example. > > c.a.example. > > d.a.example. > > ... > > z.a.example. > > > > And I want to separate z.a.example, but not the others, and there are > > often changes to the list. Without having to mark every one, how can I > > (as a.example), mark above the cut that z.a.example is separate? > > Cool. Subset of branches. > > > a.example. > > b.a.example. > > c.a.example. > > d.a.example. > > ... > > z.a.example. > \ > ._perim TXT begin <schema> > > would clearly work. > > If there were a need to instead have a.example make the declaration, I > don't see an obvious answer. > This is my concern. > My first thought is for the Scheme to have a sub-notation, to indicate > that the presence of the Perimeter is not for all branches, such as by > having it list the children links it applies to. But that's not feeling > terribly satisfactory. > Not great, but probably required. Could the RFC include a note about this possible issue? > d/ > > -- > Dave Crocker > Brandenburg InternetWorking > bbiw.net > >
- Re: [dbound] [DNSOP] Over on the dbound list: dra… Bob Harold
- Re: [dbound] [DNSOP] Over on the dbound list: dra… Dave Crocker
- Re: [dbound] [DNSOP] Over on the dbound list: dra… Bob Harold
- Re: [dbound] [DNSOP] Over on the dbound list: dra… Dave Crocker