> Mark explained this idea to me in Pittsburgh and once I finally
> understood it, it seemed extremely useful at a very low cost.
> Essentially, you'd leave the A6 records for the shortest global
> prefixes alone, but put site-local and, if you wish, link-local
> prefixes into your DNS, putting a DNS name of your choice into the
> final A6 record with prefix length=0. Example:
>
>
> $ORIGIN example.com.
> myhost A6 64 ::1234:5678:9abc:def0 subnet-one.ip6
> subnet-one.ip6 A6 48 0:0:0:1:: ip6
> A6 0 fe80:0:0:: link-one
> ip6 A6 48 0::0 example-com-usa.ip6.my-isp.net.
> A6 0 fec0:0:0:: usa-hq
> yourhost A6 64 ::0246:8ace:1357:9bdf subnet-two.ip6
> subnet-two.ip6 A6 48 0:0:0:2:: ip6
> A6 0 fe80:0:0:: link-two
> herhost A6 64 ::048c:159d:26ae:37bf subnet-eins.ip6
> subnet-eins.ip6 A6 48 0:0:0:1 ip6de
> A6 0 fe80:0:0:: link-eins
> ip6de A6 48 0::0 example-com-de.ip6.andere-isp.de.
> A6 0 fec0:0:0:: de-site
> usa-hq TXT "There need not be any record at this label."
> de-hq TXT "There need not be any record at this label either."
>
> So now if myhost looks up yourhost it gets a site-local address as
> well as a global address. The last RR of yourhost's site-local A6
> chain has the same "prefix name" field as the last RR of myhost's
> site-local A6 chain, so myhost can conclude that yourhost is on the
> same site. Similarly, it can conclude that yourhost is not on the
> same link as my host, and that herhost is not on the same link or
> site.
They can also be used to reference the appropriate value
to fill in the sockaddr link field.
>
> > Currently A6 records w/ prefix 0 do not have a prefix
> > domain name. Redefining A6 records with prefix 0 to
> > have a domain name and to use this name as a site /
> > link local identifier is still possible at this point
> > in time.
> >
> > Doing this would provide a mechanism to identify which
> > of a number of addresses you which to use.
>
> Today I thought of one possible simplification. Couldn't the *owner
> name* of the final A6 record in a chain be used for the same purpose?
I doesn't work where the chains are of length 1.
Mark
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [EMAIL PROTECTED]
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