Re: [dbound] [DNSOP] Over on the dbound list: draft-dcrocker-dns-perimeter-00
Dave Crocker <dhc@dcrocker.net> Thu, 04 April 2019 17:29 UTC
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To: Bob Harold <rharolde@umich.edu>
Cc: dbound@ietf.org
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From: Dave Crocker <dhc@dcrocker.net>
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Organization: Brandenburg InternetWorking
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Date: Thu, 04 Apr 2019 10:28:56 -0700
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Subject: Re: [dbound] [DNSOP] Over on the dbound list: draft-dcrocker-dns-perimeter-00
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On 4/4/2019 9:57 AM, Bob Harold wrote: > 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. OK. Since adding constructs makes a spec and its implementation more complicated,(*) I'll ask the group whether the simplicity of having just 'begin' and 'end' for marking Perimeters -- at the expense of the verbosity of extra records -- is preferred or whether adding a third choice, as a contraction, such as "endbegin", is preferred so there would be only one record. (For completeness: The 'part' construct doesn't define a Perimeter, so it doesn't come into this issue.) > 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? Sure. But I'll also ask for suggestions to see whether we can have Perimeter handle this sufficiently to satisfy folk. I'm taking the open question as: How should DNS Perimeter Overlay provide for a parent node to specify that a subordinate Perimeter applies only to a subset of its subordinate links? It might help to move this from the abstract to the concrete if we develop a few real-world examples we'd like to cover. I don't have any to suggest but hope others do. d/ (*) I tend to think of additions as having disproportionate effects, best treated as exponential. So adding even one item to a small list of features is worth worrying about. -- 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