Re: a comment on draft-stenberg-mif-mpvd-dns-00
Markus Stenberg <markus.stenberg@iki.fi> Tue, 03 November 2015 07:52 UTC
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Subject: Re: a comment on draft-stenberg-mif-mpvd-dns-00
From: Markus Stenberg <markus.stenberg@iki.fi>
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Date: Tue, 03 Nov 2015 16:52:13 +0900
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To: 神明達哉 <jinmei@wide.ad.jp>
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> On 3.11.2015, at 15.56, 神明達哉 <jinmei@wide.ad.jp> wrote: > I have one quick comment on draft-stenberg-mif-mpvd-dns-00: about the > use of TXT RR. From a quick read it seems to me to violate the > general guidance of avoiding abuse of TXT as described in RFC5507. Is > there any specific reason why this must be TXT despite the > recommendation of the RFC? If there is, I think the draft should > explain it more explicitly; if not, I'd suggest getting and using a > new type of RR for this purpose. We needed a way to get key=value structure to the clients, where the guidance (conflict with other uses being an issue) isn't an issue because we start the lookup (at quite problematic) _pvd.<reverse> place for a PTR. Similarly as we did not want to create a TLV registry, the encoding efficiency problem really isn't there. However, as DNS wildcarding does not work with the _pvd.*.ip6.arpa (first part has to be the wildcard still I guess?), _that_ I consider more controversial choice, possibly _there_ would be demand for e.g. PVDPTR type that would be just at the <reverse>.ip6.arpa and point elsewhere.. Another reason we used existing types was to make implementation simpler due to not having to invent new encoders and decoders; hacking together prototype was very easy with these at least. Cheers, -Markus