Re: [dnsext] draft-li-dnsext-ipv4-ipv6 -- a more versatile proposal

[Paul Vixie <vixie@isc.org>]

> From: Alfred =?hp-roman8?B?SM5uZXM=?= <ah@TR-Sys.de>
> Date: Fri, 6 Nov 2009 22:02:05 +0100 (MEZ)
> 
> The recent I-D, "DNS Extensions to Support IPv4 and IPv6",
> draft-li-dnsext-ipv4-ipv6-02, proposes a new specific QUERY TYPE
> to pick up A and AAAA RRsets in a single DNS request.

what a terrible idea.  we're not going to add yet another query before
the start of every tcp/ip session.  the way to handle this is to include
AAAA as additional data in A responses, and include A as additional data
in AAAA responses.

> This seems to be a specific solution restricted to a narrow,
> yet frequent, desire / use case.
> 
> I suggest to expand on this proposal by defining a more versatile and
> general mechanism that does not need to be changed again should any
> new 'address' RRtype be defined in the future, and that will have
> different other use cases for the pickup of 'grouped' RRsets
> (e.g. TXT records together with PTR records on DNSBL lookups,
> mail policy TXT RRs together with MX RRs, etc.).
> 
> This proposal is inspired by similar functionality present in DHCP
> and an old, expired proposal to allow multiple queries in a single
> DNS request.
> 
> It should help save round trips and eliminate the need to specify
> dedicated additional section processing for some new RR types in
> the future, saving additional, RR type specific processing logic in
> authorities and caching resolvers.
> 
> Rough sketch of the idea:  << RR-Group Query >>
>
> ...

this should also be pursued, but not as part of deploying IPv6.