Re: wrt: draft-ietf-dnsop-inaddr-required-00.txt

[Kent Crispin <kent@songbird.com>]

On Tue, Aug 15, 2000 at 02:52:16PM +0200, Lars-Johan Liman wrote:
> Is the behaviour to check and verify reverse lookup something that we
> really want to encourage? Then why? There are lots of legal situations
> where the forward lookup mismatches the reverse lookup,

Named virtual hosts (where one IP serves many virtual domains, and only
one of them could be the proper in-addr, and the browser supplied name
is used to disambiguate).  There are millions of these.  Most of them
are used only for web sites with email, and web servers and email
servers typically don't do the check that Randy describes (what's the
inverse address of a mx record?)  So for web and email, you can't 
require in-addr.

In any case, the number of domains with no in-addr is huge, and will 
remain so.

-- 
Kent Crispin                               "Do good, and you'll be
kent@songbird.com                           lonesome." -- Mark Twain