Re: [v6ops] How do you solve 3GPP issue if neither operator nor handset supports PD?

Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com> Tue, 24 November 2020 17:12 UTC

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Subject: Re: [v6ops] How do you solve 3GPP issue if neither operator nor handset supports PD?
From: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>
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In-reply-to: Your message of "Tue, 24 Nov 2020 16:44:11 +0000 ." <1b284a58699e4fa39b1602b8f3fede28@boeing.com>
Date: Tue, 24 Nov 2020 18:12:15 +0100
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In your letter dated Tue, 24 Nov 2020 16:44:11 +0000 you wrote:
>Getting what I said earlier onto this thread, I think we should be discussi=
>ng the
>LLA-based PD scheme specified in:
>
>https://datatracker.ietf.org/doc/draft-templin-6man-lla-type/

In my opinion it is a quite broken design to put protocol bits in IPv6
addresses when ND already has an option syntax for these types of extensions.

In addtion, there is realistically no risk of collision in link local address
when the IID is either EUI-64 or pseudo random. EUI-64 should not be used in
new links type so there cannot be a risk of collision between EUI and OMNI.
There is no risk of collision of pseudo random and OMNI. 

Of course, there is the case that a pseudo random number generator could
be broken. But that is smething that should be solved by improving the
implementation, not by putting extra bits in addresses

What we see here is how how creative use of bits starts failing. We had
opague IIDs. Nobody really cares if an IID is EUI-64 or pseudo random.
Those IIDs co-exists well.

Then OMNI comes along and puts protocol bits in link-local addresses. Next step
now we need flags in link-local addresses.

So the obvious thing to do is to kill OMNI. Do not put special bits in IIDs,
and put everything you want to encode in extension headers and payloads.