Re: [IPv6] RFC 6724 shouldn't prefer partial reachability over reachability

Michael Richardson <mcr+ietf@sandelman.ca> Sun, 26 November 2023 15:20 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Kyle Rose <krose=40krose.org@dmarc.ietf.org>, 6man WG <ipv6@ietf.org>
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Comments: In-reply-to Kyle Rose <krose=40krose.org@dmarc.ietf.org> message dated "Fri, 24 Nov 2023 19:33:31 -0500."
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Date: Sun, 26 Nov 2023 16:20:11 +0100
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Subject: Re: [IPv6] RFC 6724 shouldn't prefer partial reachability over reachability
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Kyle Rose <krose=40krose.org@dmarc.ietf.org> wrote:
    >> > ULA and GUA must be treated differently for purposes of address
    >> selection: what remains in dispute is exactly *how* that treatment
    >> should differ, not *whether* it should.
    >>
    >> Yes. What we want, I think, is ULA->ULA to win over GUA->GUA and that
    >> means picking source and destination simultaneously. And we want
    >> ULA->GUA to never be tried unless the stack knows that NPTv6 is in
    >> place. And we can't do any of that correctly based on getaddrinfo()
    >> alone. So the draft is the best compromise given that we currently
    >> live with getaddrinfo().
    >>

    > I think it's still an open question (to Mark's email from Wednesday
    > night ET) whether we want to prefer GUA->GUA over ULA->ULA or vice
    > versa. As a small-time operator I don't have a preference since I do
    > not use the same names for both ULA and GUA AAAA records, but
    > preferring ULA->ULA does introduce one failure mode not under control
    > of the local operator, which is *another operator* leaking ULA

But, you as an operator, would be deleting those announcements based upon
your well configured BCP38.  So, it's really is entirely under your control,
which I agree with you: is a better.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-                      *I*LIKE*TRAINS*