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Re: [v6ops] PI heresy [draft-ietf-v6ops-ula-usage-recommendations - work or abandon?]

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 13 November 2015 19:01 UTC

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To: Philip Homburg <pch-v6ops-3@u-1.phicoh.com>, v6ops@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <564633AB.9000509@gmail.com>
Date: Sat, 14 Nov 2015 08:02:03 +1300
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Subject: Re: [v6ops] PI heresy [draft-ietf-v6ops-ula-usage-recommendations - work or abandon?]
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On 14/11/2015 01:49, Philip Homburg wrote:
>> Networks break further upstream, without the actual upstream being
>> noticeable
>> broken.  Networks break certain paths, while others are working fine.
>>
>> We can do better than all-or-nothing.  We should.
> 
> I don't think a host should try to figure out which paths work and which
> don't.
> 
> Maybe somebody can come up with a simple algorithm that generalises
> happy-eyeballs and that is compatible with today's host operating systems.
> But I doubt it. 

We tried. It's called shim6. Firewalls break it.

   Brian

> 
> So while we wait for hosts to magically figure out what works and what doesn't
> (and for mobile hosts, in any possible context, even when there is
> high packet loss on the local link, etc),
> 
> I propose that routers just inform hosts which source prefixes are unusable
> according to unspecified monitoring code running on the router. (Obviously,
> routers should also propate that knowledge over internal routing protocols in
> setups with multiple routers).
> 
> 
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