Re: [tae] New draft: announcing the supported transports via DNS
"Dan Wing" <dwing@cisco.com> Fri, 18 September 2009 19:06 UTC
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From: Dan Wing <dwing@cisco.com>
To: 'Joe Touch' <touch@ISI.EDU>
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Date: Fri, 18 Sep 2009 12:07:06 -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: Joe Touch [mailto:touch@ISI.EDU] > Sent: Friday, September 18, 2009 11:58 AM > To: Dan Wing > Cc: 'Michael Welzl'; tae@ietf.org > Subject: Re: [tae] New draft: announcing the supported > transports via DNS > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > > Dan Wing wrote: > >> Dan Wing wrote: > >>>> As you note, addresses are sometimes used for non-human > >>>> purposes, and > >>>> with IPv6 they could be created on the fly - I wouldn't want > >>>> to have to > >>>> wait to register them in the DNS vs exchanging them in-band. > >>> So, when you exchange them (in whatever > >>> application-specific protocol > >>> you're using to exchange those addresses, e.g., SDP for > RTSP, SAP, > >>> and SIP) using that application-specific protocol is the > best place > >>> to indicate which transport protocol is supported on the host. > >> I might want to say "here, use this address, but use whatever > >> transport the other end wants to use for reliable object > >> transfer", which wouldn't have the information available to > >> the protocol that indicates the address. > > > > I don't understand; if you have an existing protocol to send > > an IPv4 or IPv6 address around, it can be extended to include > > a port (as most application developers have found necessary, > > as we can't have more than one HTTP server listening on port > > 80 behind an in-home NAT), and it can likewise be extended to > > say "TCP=yes, SCTP=yes, DCCP=no". > > It can. Or it can be "here's an address and a port, you > figure out what transports are provided". Sure. That's easy -- probe for whatever transport you want to try. The draft draft-yourtchenko-tran-announce-dns-00 is trying to optimize that case. In any event, probes are necessary because there may be middleboxes that block certain transport protocols. > > You're saying such an extension is not possible / reasonable? > > I'm saying it should not be strictly required. I agree. And it isn't required. > > Do you have a proposal you could share on the mailing list or > > in an I-D? > > No proposal; just trying to see if proposed solutions can > handle cases I consider useful. Can you enumerate those requirements, or shall we just throw things at the wall? This goes back to Caitlin's post <http://www.ietf.org/mail-archive/web/tae/current/msg00114.html> which suggested we take a step back and look at what we want. I'm all for doing that. This list has been too quiet, so we wrote a straw man. I take it you don't like the straw man because it's trying to cover the DNS use-case, and your use-case is IP address literals, and your use-case can incur additional round trip(s) to learn which transport protocols the server supports. -d > Joe > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (MingW32) > > iEYEARECAAYFAkqz2E4ACgkQE5f5cImnZrs0LQCfePjjO8Fa7GYn627BH3pxn31b > FOEAn2/DF1X8mkmWmrYrOKd3sQVAwtGl > =0YqU > -----END PGP SIGNATURE-----
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- [tae] New draft: announcing the supported transpo… Andrew Yourtchenko
- Re: [tae] New draft: announcing the supported tra… Melinda Shore
- Re: [tae] New draft: announcing the supported tra… Michael Welzl
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- Re: [tae] New draft: announcing the supported tra… Caitlin Bestler
- Re: [tae] New draft: announcing the supported tra… Michael Welzl
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Andrew Yourtchenko
- Re: [tae] New draft: announcing the supported tra… Andrew Yourtchenko
- Re: [tae] New draft: announcing the supported tra… Andrew Yourtchenko
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Andrew Yourtchenko
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Dan Wing
- Re: [tae] New draft: announcing the supported tra… Andrew Yourtchenko
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Joe Touch
- Re: [tae] New draft: announcing the supported tra… Dan Wing