Re: [dnsext] Some thoughts on the updated aliasing draft
Tony Finch <dot@dotat.at> Mon, 28 March 2011 12:50 UTC
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Date: Mon, 28 Mar 2011 13:52:02 +0100
From: Tony Finch <dot@dotat.at>
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To: John Levine <johnl@iecc.com>
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Subject: Re: [dnsext] Some thoughts on the updated aliasing draft
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John Levine <johnl@iecc.com> wrote: > > So what can we offer? If it's something like CLONE or BNAME, we offer > an upgrade path. You're no worse off than you'd be with manual > bundling and manual application configuration, and to the extent you > upgrade your applications to know about the new DNS stuff, your > configuration job gets easier. > > That's not as cool as the mythical magic hack. Will people find it > useful? Having done my share of SMTP server hackery, I would. If > it's as important to handle variant names as people say it is, they'll > upgrade. If not, well, that's OK too. Yes. I think it's worth splitting the feature into forward and reverse parts. The forward direction is alias -> canonical, as in CNAME and DNAME. We can use CNAME synthesis to support old clients, and perhaps a DNSSEC algorithm bump to avoid validator problems. Old servers can work with the new BNAME (or whatever) aliases using their existing support for aliases, which typically means explicit per-alias configuration. The reverse direction is canonical name -> alias list, which is for the server to automatically configure its aliases from a trusted part of the DNS. (Does the client have any use for this information?) Servers that understand this feature are easier to configure. This feature is also useful if the aliases no not use BNAME, e.g. if they are CNAMEs or A or AAAA records. Both the new forward and reverse features will be useful independently of each other. Tony. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ Trafalgar: Westerly or southwesterly, becoming cyclonic at times, 4 or 5, occasionally 6 in Biscay and Fitzroy. Moderate or rough. Rain or showers, fog patches in north Biscay. Good to poor, occasionally very poor in north Biscay.
- [dnsext] Some thoughts on the updated aliasing dr… Ted Hardie
- Re: [dnsext] Some thoughts on the updated aliasin… John Levine
- Re: [dnsext] Some thoughts on the updated aliasin… Paul Vixie
- Re: [dnsext] Some thoughts on the updated aliasin… Suzanne Woolf
- Re: [dnsext] Some thoughts on the updated aliasin… Ted Hardie
- Re: [dnsext] Some thoughts on the updated aliasin… John Levine
- Re: [dnsext] Some thoughts on the updated aliasin… Paul Vixie
- Re: [dnsext] Some thoughts on the updated aliasin… Suzanne Woolf
- Re: [dnsext] Some thoughts on the updated aliasin… John Levine
- Re: [dnsext] Some thoughts on the updated aliasin… Suzanne Woolf
- Re: [dnsext] Some thoughts on the updated aliasin… Mark Andrews
- Re: [dnsext] Some thoughts on the updated aliasin… Masataka Ohta
- Re: [dnsext] Some thoughts on the updated aliasin… John R. Levine
- Re: [dnsext] Some thoughts on the updated aliasin… Cary Karp
- Re: [dnsext] Some thoughts on the updated aliasin… Xiaodong Lee
- Re: [dnsext] Some thoughts on the updated aliasin… Paul Vixie
- Re: [dnsext] Some thoughts on the updated aliasin… Alex Bligh
- Re: [dnsext] Some thoughts on the updated aliasin… Tony Finch
- Re: [dnsext] Some thoughts on the updated aliasin… Tony Finch
- Re: [dnsext] Some thoughts on the updated aliasin… John Levine
- Re: [dnsext] Some thoughts on the updated aliasin… Douglas Otis
- Re: [dnsext] Some thoughts on the updated aliasin… Florian Weimer
- Re: [dnsext] Some thoughts on the updated aliasin… Tony Finch
- Re: [dnsext] Some thoughts on the updated aliasin… Doug Barton