Re: [mif] Domain name issue in draft-stenberg-mif-mpvd-dns
Markus Stenberg <markus.stenberg@iki.fi> Tue, 15 March 2016 11:35 UTC
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From: Markus Stenberg <markus.stenberg@iki.fi>
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Date: Tue, 15 Mar 2016 13:35:45 +0200
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References: <56E7E35D.6040108@bellis.me.uk> <2514F81A-CDC6-4F90-A76D-816A8F4EEDC4@iki.fi> <56E7F060.1040004@bellis.me.uk>
To: Ray Bellis <ray@bellis.me.uk>
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Cc: draft-stenberg-mif-mpvd-dns@ietf.org, mif@ietf.org
Subject: Re: [mif] Domain name issue in draft-stenberg-mif-mpvd-dns
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> On 15.3.2016, at 13.22, Ray Bellis <ray@bellis.me.uk> wrote: > On 15/03/2016 11:08, Markus Stenberg wrote: >> Actually we considered it a feature and not a bug, i.e. subdelegation >> would still result in same PVD available. I am not sure your scheme >> would work with subdelegation though. > OK, I see that, but I still think you have a problem since: > > 2001:0:0:0::/64 > > and > > 2001:0:0:0:0::/80 > > and even: > > 2001::/16 > > will end up at the same domain name. Not necessarily. Your home _could_ provide (split horizon) different records than someone else's home. Or ISP could subdelegate that part to your home (then again, I am not sure I would bet on it). >> Given broad example, ISP has /40 for home users, but ultimately the >> prefix in use may be e.g. /64 (or even something more narrow). Having >> the _pvd.* in 'all' prefix lengths would be obviously available, or >> performing (up to 128) lookups with subsequently shorter/longer >> prefix lengths. >> >> I am not sure how client would know to start lookups from /40, or >> from /56 assigned to a home, if the link has /64. > In RFC 7216 we took a "minimal" tree climbing approach, putting the > records at "common" LIR / RIR prefix boundaries of /64, /56, /48, or > /32. Anything more would have angered the DNS Gods... > > Is there no other way for the client to learn the size of the upstream > PD from which its /64 has been carved out? Not without some new option in RA/DHCP I think. Cheers, -Markus
- [mif] Domain name issue in draft-stenberg-mif-mpv… Ray Bellis
- Re: [mif] Domain name issue in draft-stenberg-mif… Markus Stenberg
- Re: [mif] Domain name issue in draft-stenberg-mif… Ray Bellis
- Re: [mif] Domain name issue in draft-stenberg-mif… Markus Stenberg
- Re: [mif] Domain name issue in draft-stenberg-mif… Margaret Cullen