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

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Thu, 18 June 2020 10:04 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>
Subject: RE: [EXTERNAL] Re: 64bit MAC addresses and SLAAC
Thread-Topic: [EXTERNAL] Re: 64bit MAC addresses and SLAAC
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Hello Phil

> -----Original Message-----
> From: pch-b9D3CB0F5@u-1.phicoh.com <pch-b9D3CB0F5@u-1.phicoh.com>
> On Behalf Of Philip Homburg
> Sent: jeudi 18 juin 2020 11:43
> To: ipv6@ietf.org
> Cc: Pascal Thubert (pthubert) <pthubert@cisco.com>
> Subject: Re: [EXTERNAL] Re: 64bit MAC addresses and SLAAC
> 
> > 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.

We agree

> 
> > 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.

Who said it was? 

We agree again...

Pascal

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