Re: it appears that this whole "ask for AAAA before A" will be painful

["D. J. Bernstein" <djb@cr.yp.to>]

Paul Vixie writes:
> let web sites like united.com be stranded in the new IPv6 era?

Wow. Do you think that IPv6 is some sort of unstoppable force that will
beat united.com into submission? Has it ever occurred to you that users
care a hell of a lot more about united.com than about IPv6? For further
comments, see http://cr.yp.to/djbdns/ipv6mess.html.

> SERVFAIL is an indication, not that the type isn't known, but that the
> zone is invalid at that server.

That's a wild oversimplification. SERVFAIL can indicate all sorts of
other problems.

> recursive servers are within their rights to cache SERVFAIL at <ZONE,CLASS>

That's absurd.

Similarly, it's silly for a client to abandon A records merely because
the AAAA-IPv6 connection attempt has failed. The A records are valid
whether or not AAAA records exist.

Obviously trying A first is better right now, although one can imagine a
future world where trying AAAA first is better.

None of this would ever have been an issue if people had used 16-byte A
records instead of inventing a completely unnecessary AAAA type.

---D. J. Bernstein, Associate Professor, Department of Mathematics,
Statistics, and Computer Science, University of Illinois at Chicago



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