On Fri, 19 Jan 2001, [EMAIL PROTECTED] wrote:
> >One other thing to keep in mind is that unlike an endless chain of
> >glueless NS records, A6 records will, in general, chain to other records
> >in the same zone and thus a significant part of the chain will be returned
> >on each query. Thus, NS chains require much more work to resolve and
> >should not be compared to A6 chains. It shouldn't take more than 2 or 3
> >queries to resolve a full A6 chain. In all likelyhood, prefixes for
> >popular providers and services will remain cached, and resolving the names
> >of virtual hosts and hosts on the same network will only take a single
> >query, just as they do now with A records. -Nathan
>
> A6 chain will not stay in the same zone. it will go up from leaf site
> to a small ISP, then to middle ISP, and then to large ISP. this is
> the purpose of A6.
>
> foo.itojun.org. IN A6 64 ::9876:5432:9876:5432 segment0.itojun.org.
> segment0.itojun.org. IN A6 48 ::1234:0:0:0:0 ispX.net.
> ispX.net. IN A6 40 0:0:0012:: ispY.net.
> ispY.net. IN A6 32 0:0:2300:: ispZ.net.
> ispZ.net. IN A6 16 0:9876:: ispU.net.
> ispU.net. IN A6 0 1234::
I was envisioning something more along the lines of:
foo.itojun.org. A6 64 ::9876:5432:9876:5432 segment0.itojun.org.
segment0.itojun.org. A6 48 0:0:0:1234:: itojun-prefix.ispX.net.
itojun-prefix.ispX.net. A6 40 0:0:0008:: tokyo8-prefix.ispX.net.
tokyo8-prefix.ispX.net. A6 32 0:0:2300:: tokyo-prefix.ispX.net.
ispX-prefix.ispY.net. A6 16 0:9876:: japan-prefix.ispY.net.
japan-prefix.ispY.net. A6 0 1234::
How many intermediate ISPs/zones are there typically expected to be?
Site->ISP->backbone seems like a reasonable configuration, possibly with
one additional ISP in the middle. It seems that the first one or two ISP
prefixes would stay in caches of most busy servers. -Nathan
--
+-------------------+---------------------+------------------------+
| Nathan Lutchansky | [EMAIL PROTECTED] | Lithium Technologies |
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| I dread success. To have succeeded is to have finished one's |
| business on earth... I like a state of continual becoming, |
| with a goal in front and not behind. - George Bernard Shaw |
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