>
> >> 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.
>
> Matt, did you intentionally pick linklocal address as the example
> above? I don't think you should put linklocal address onto globally
> reachable DNS name tree. even site-local is questionable too.
> or do you expect some magical code in name server to filter fe80::
> prefixes out from remote queries?
No, but it is not unreasonable to have getipnodebyname() and / or
getaddrinfo() use the "prefix" field to optionally filter non
local addresses based on a local table of site / link local names
and in getaddrinfo() case to fill in sin6_scope_id.
Mark
>
> itojun
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Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
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