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Re: [EXTERNAL] Re: 64bit MAC addresses and SLAAC

Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com> Thu, 18 June 2020 09:43 UTC

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Cc: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Subject: Re: [EXTERNAL] Re: 64bit MAC addresses and SLAAC
From: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>
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Date: Thu, 18 Jun 2020 11:43:24 +0200
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> In the case of IPv6 over IEEE 802.15.4, there is a centralized
> assignment of the short MAC address, and then SLAAC can derive the
> IP address from that MAC address to enable stateless compression.
> Nothing wrong with that if that serves the purpose.

If the MAC address is dynamically assigned by the network, then we can
assume that having the IID based on the MAC address is safe from the point
of view of tracking.

This is very far from the original concept of using a globally unique MAC
address as IID.

We should avoid using tracking identifiers as IIDs. However, that does not
rule out using other dynamically generated identifiers as part of IIDs.

> When people want the address to be known by the management
> system and associated to the role / position of the device, the
> easiest is usually the pre-provisioning, and forcing DHCP in that
> picture is a hard sell.

How is pre-provisioning related to SLAAC? Lot's of servers get addresses from
out of band configuration systems.

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