To:
"D. J. Bernstein" <djb@cr.yp.to>
Cc:
dnsop@cafax.se
From:
Jim Reid <Jim.Reid@nominum.com>
Date:
Thu, 17 Jul 2003 04:40:14 -0700
In-Reply-To:
Message from "D. J. Bernstein" <djb@cr.yp.to> of "16 Jul 2003 22:12:29 -0000." <20030716221229.91127.qmail@cr.yp.to>
Sender:
owner-dnsop@cafax.se
Subject:
Re: regarding the respsize draft: preferring glue of certain types
>>>>> "djb" == D J Bernstein <djb@cr.yp.to> writes:
djb> The program using the .com DNS server addresses is the same
djb> DNS resolver that was talking to the root DNS server. Why is
djb> it useful for this DNS resolver to receive _both_ an A record
djb> and an AAAA record for a single .com DNS server?
Because this .com server has NO WAY of knowing if the querying server
has a preference for IPv6 or IPv4 resource records. Or which of these
is "better" for the resolving server. [And, by implication, that
resolving server's clients which could include forwarding name
servers.] My earlier mail why explained your assumption about using
the query's transport protocol to determine this was flawed. I gave
two counter examples: four if you swap the IPv6 issues for IPv4 and
vice versa. Others have made the same point. I'm sorry if you are
unable to understand this.
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