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Re: [DNSOP] [homenet] ip6.arpa reverse delegation

Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> Mon, 24 November 2014 15:57 UTC

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Date: Mon, 24 Nov 2014 16:56:57 +0100
Message-ID: <877fykpp6e.wl-jch@pps.univ-paris-diderot.fr>
From: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
To: homenet@ietf.org, dnsop@ietf.org
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References: <29673.1416777252@sandelman.ca> <3351A0A8-F7DE-40ED-8EA5-06393764D250@iki.fi>
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Subject: Re: [DNSOP] [homenet] ip6.arpa reverse delegation
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>> a method to delegate reverse [DNS] zones to CPE devices

> Is this actually desired by the operators?

I'm a little ashamed to admit that I don't understand the purpose of
reverse DNS.

To my naive eyes, if you already know the IP of a host, then you should be
able to ask the host directly for its hostname at the application layer --
unless you've already got the information (think SMTP HELO).  If your
application protocol doesn't support doing that, then there's RFC 4620.
(Yeah, I know, experimental.)

Note that there's no new security issues with doing that -- you still
confirm that the given hostname maps to the host's IP address, as you
already do with the hostname obtained from reverse DNS.

I'm probably confused -- could somebody please explain?

-- Juliusz

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