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Re: Market forces

Alexandre Petrescu <alexandre.petrescu@gmail.com> Tue, 10 November 2020 10:54 UTC

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Subject: Re: Market forces
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Le 10/11/2020 à 00:12, Kerry Lynn a écrit :
[...]

> So, dumb question, but would it make sense to consider some local 
> coordination mechanism that assigns "subnet" meaning to the most
> significant bits of the IIDs on a link?

I think it is a good idea.  I think that could be in agreement with a 
relevant part in RFC4291 "IPv6 address archi" section 2.5.4 "GUAs" which 
pictures an address as a set of variable length prefix, subnet ID and IID:

>  The general format for IPv6 Global Unicast addresses is as follows:
> 
>    |         n bits         |   m bits  |       128-n-m bits         |
>    +------------------------+-----------+----------------------------+
>    | global routing prefix  | subnet ID |       interface ID         |
>    +------------------------+-----------+----------------------------+
> [end of RFC quote.]



> RFC 7136 basically says that IIDs have no structure, RFC 8065 says
> we'd like to have at least 46 bits of entropy for IIDs used in global
> addresses and ideally ~59. Other RFCs have defined privacy IIDs, etc.
> RFC 6282 allows for compression of arbitrary prefixes; no /64
> architectural constraint there.

So yes, I agree with you - no constraint there.  Thank you for this list 
of RFCs.

There might be many other RFCs that do have the 64bit constraint, like 
the IPv6-over-foo and HIP RFCs.

Alex

> 
> Kerry
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