Re: [tae] New draft: announcing the supported transports via DNS

"Dan Wing" <dwing@cisco.com> Fri, 18 September 2009 18:08 UTC

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From: Dan Wing <dwing@cisco.com>
To: 'Joe Touch' <touch@ISI.EDU>, 'Michael Welzl' <michawe@ifi.uio.no>
References: <Pine.LNX.4.64.0909180057060.5479@zippy.stdio.be> <77F0974F-62CD-411C-96D3-C29E6D872DEA@asomi.com> <4AB2E6AB.7020409@gmail.com><4AB3A33B.7080909@ifi.uio.no> <4AB3A5DE.1040708@isi.edu>
Date: Fri, 18 Sep 2009 11:08:55 -0700
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Cc: tae@ietf.org
Subject: Re: [tae] New draft: announcing the supported transports via DNS
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> -----Original Message-----
> From: tae-bounces@ietf.org [mailto:tae-bounces@ietf.org] On 
> Behalf Of Joe Touch
> Sent: Friday, September 18, 2009 8:23 AM
> To: Michael Welzl
> Cc: tae@ietf.org
> Subject: Re: [tae] New draft: announcing the supported 
> transports via DNS
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
> 
> Michael Welzl wrote:
> > Hi all,
> > 
> > This discussion reminds me of something else:
> > someone (I think Jana?) mentioned the possibility of negotiating
> > more than just the transport protocol, e.g. even the usage of IPv6,
> > with a negotiation protocol.
> > 
> > I recently talked about this with someone who knows more about
> > IPv6 than me (actually not hard to find such a person!), and that
> > someone said that a standard is already in place for determining
> > whether IPv6 can be used **via DNS**.
> 
> That presumes two things:
> 
> a) you know which protocol to use to get to the DNS
> 
> b) not everybody uses the DNS, at which point you definitely need to
> know the address format since you need to know the address

Not everybody uses TCP, either.  For example, RTP is commonly
sent over UDP and the IPv4 addresses are commonly signaled in
SDP as IPv4 address literals.  So RTP doesn't use DNS or TCP.

But DNS-less and TCP-less applications or usage are not the
80% that is the interesting problem.  I can't maintain
host tables for the Internet anymore -- it's too big.  The need
for DNS is more acute with long and awkward IPv6 addresses.

-d


> Joe
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