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Re: Anycast to unicast resolution (was: Re: Generic anycast addresses...)

Brian Haberman <brian@innovationslab.net> Tue, 11 June 2019 14:04 UTC

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Subject: Re: Anycast to unicast resolution (was: Re: Generic anycast addresses...)
To: ipv6@ietf.org
References: <CAO42Z2xDUYOZqQ2_gjApifaPO3uG-kzjHpzND3nBD=hzw1TW2A@mail.gmail.com> <20190602130300.ebqbmvhb47r7pdog@faui48f.informatik.uni-erlangen.de> <CAO42Z2z9JkczxvYb09d4Fp7O17nnd0RHjPGnTaG26RPxPVa+Xw@mail.gmail.com> <alpine.DEB.2.20.1906030910010.19892@uplift.swm.pp.se> <19028.1559573360@localhost> <3d99d907-669e-46db-e68b-0a1bdf4a1f89@huitema.net> <18638.1559609425@localhost> <625b5d9c-7532-4b5f-9e1a-b175092cac1c@gmail.com> <D1C960B4-DA32-4CFD-8021-BC4B45693A2D@steffann.nl> <c4bec6bf-a2ca-39fa-4e93-3c59c212dfb3@huitema.net> <20190604183104.iaww3aaembg6g7un@faui48f.informatik.uni-erlangen.de>
From: Brian Haberman <brian@innovationslab.net>
Openpgp: preference=signencrypt
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Date: Tue, 11 Jun 2019 10:04:18 -0400
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On 6/4/19 2:31 PM, Toerless Eckert wrote:
> Christian:
> 
> I would certainly like a mechanism to resolve from anycast to unicast
> that is independent of a specific transport protocol like QUIC. I guess
> the interesting new requirement that QUIC introduced into that equation
> is that such resolution should avoid any additional round-trip.
> 
> One way to do this would be to have a generic simple anycast resolution
> mechanism with one request and one reply and both can carry a
> transport protocol specific payload. Only thing it costs is that those
> two packets reduce the transport size available to the first request/reply,
> not sure how problematic this would be. But at least it would be lovely
> not having to reinvent that wheel for QUIC, TCP, STCP and the vairiety
> of UDP transports we have.

There have been on/off discussions for years among a group of IETF
participants about using the Home-Address option in MIP6 to do such
anycast to unicast mapping.

Brian

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