[dnsext] Autoconfiguration of variants

"George Barwood" <george.barwood@blueyonder.co.uk> Tue, 08 March 2011 22:57 UTC

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From: "George Barwood" <george.barwood@blueyonder.co.uk>
To: <dnsext@ietf.org>
Date: Tue, 8 Mar 2011 22:58:10 -0000
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Subject: [dnsext] Autoconfiguration of variants
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I have not yet properly understood the CLONE draft, for which I apologise,
but it seems to suffer from some technical issues.

How about this approach:

(1) A new RRTYPE that defines the aliases for a given domain.

www.mybigbank.com. VARIANTS www.my-big-bank.com. | www.my-bigbank.com. | www.mybig-bank.com.

(2) An application ( say a web server ) that is configured to handle www.mybigbank.com will on initialisation
check the DNS for variants, and if they are defined, will automatically configure them.

(3) Authoritative DNS servers when they see a VARIANTS record will auto-configure the appropriate copy zones.
For DNSSEC this needs to be handled during zone signing. 

(4) Possibly for concise expression, instead of a simple list of domain names, some limited pattern matching
might be allowed in the RDATA of the VARIANTS record, e.g.

www.mybigbank.com. VARIANTS www.my[-]big[-]bank.com.

(5) Resolvers do not need updating.

George (apologies if this is stupid, or is equivalent to an existing proposal )