Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 07 January 2021 05:22 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Fernando Gont <fgont@si6networks.com>, IPv6 Operations <v6ops@ietf.org>, 6MAN <6man@ietf.org>
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Date: Thu, 07 Jan 2021 00:22:19 -0500
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Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
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Fernando Gont <fgont@si6networks.com> wrote:
    > But this is where we go back to the original question:
    > * RFC4007 says that global scope addresses are globally unique.

    > * RFC4193 aims to reduce the collision fo a number of ULA prefixes when
    > grouped together, but certainly does *not* result in globally-unique
    > prefixes. Still, RFC4193 claims that ULAs globals.

    > So from the pov of RFC4193, ULAs are globals. From the pov of RFC4007, they
    > are not.

    > Which of the two (RFC4007 vs RFC4193) takes precedence?

It really doesn't matter, because Global has many terms.

ULAs are globally unique (ideally), but are not globally routable.

Their lack of routability is not an architectural consideration, but a
bureaucratic RIR-based concern.  They don't get RPSL, RPKI, whois or reverse DNS.

{Whether you are convinced of the statistics of ULA-R being unique or not,
does not change the goal that they be unique}

RFC4007 defines a Global Scope. (Not Global Routing)
ULAs have Global Scope, and I see nothing in RFC4007 that contradicts that.

Unless, you live in IPv4 land, and think that everything that isn't RFC1918
must be routable. And I'm sure that you don't think that way.

This python library you mention is wrong, but being a python library, is
probably too opinionate to listen to reason.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide