Re: slaac-renum: New rev of draft-gont-6man-slaac-renum (Fwd: New Version Notification for draft-gont-6man-slaac-renum-08.txt)

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 22 May 2020 21:32 UTC

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Subject: Re: slaac-renum: New rev of draft-gont-6man-slaac-renum (Fwd: New Version Notification for draft-gont-6man-slaac-renum-08.txt)
To: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>, ipv6@ietf.org
References: <158986953939.9945.6882780269741835824@ietfa.amsl.com> <8354111a-7d3f-ecfa-bcf1-baaae27209ee@si6networks.com> <m1jb46e-0000K4C@stereo.hq.phicoh.net> <04027980-51a1-a831-df0c-750c4194333e@si6networks.com> <m1jbRDw-0000IQC@stereo.hq.phicoh.net> <c8cb21e1-ce96-8fe3-8be8-1be225c916a9@gmail.com> <m1jc9Vz-0000LcC@stereo.hq.phicoh.net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sat, 23 May 2020 09:32:47 +1200
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On 23-May-20 03:23, Philip Homburg wrote:
>> Yes, of course. They *are* special. They work even if the WAN side drops
>> and even if the WAN prefix changes. 
> 
> When ULAs were introduced, it was transparent to hosts. I know that
> they now appear in address selection policy, but nothing will break if they
> are not in the policy table.

Is that true in the general case? I've certainly written code
that would need to be different if there were no ULA rules in the
RFC6724 policy table.

>> Yes. If there was a 4th type of address (we already have three, counting
>> link-local), every router in the universe would need a fix.
> 
> This is a about hosts, not routers. I think it is bad to hardcode this
> kind of knowledge in all hosts. That may come back to bite us.

That's true (which I think is exactly why we have the policy table
rather than fixed rules).

Regards
    Brian