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RE: 64bit MAC addresses and SLAAC

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Fri, 19 June 2020 09:09 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>, "ipv6@ietf.org" <ipv6@ietf.org>
CC: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Subject: RE: 64bit MAC addresses and SLAAC
Thread-Topic: 64bit MAC addresses and SLAAC
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Hello Phil

> 
> That is the nature of SLAAC. You need an IID that has a very high probabily of
> being unique. So you need enough random bits.
> 
Is this really, deep down, the nature of SLAAC? Or the consequence of not having a very fast and reliable DAD?
Arguably one could autoconfig even IPv4 within a /24 if there's a broker that serializes the requests and rejects the duplicates. 
The large IPv6 address space allowed DAD to be lousy, simple to operate in a distributed fashion, and still appear to work.
But because we know it does not, we rely on chance and large numbers vs. tackling the engineering problem.

Keep safe,

Pascal

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