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Re: 64bit MAC addresses and SLAAC

Bob Hinden <bob.hinden@gmail.com> Mon, 15 June 2020 21:02 UTC

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From: Bob Hinden <bob.hinden@gmail.com>
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Subject: Re: 64bit MAC addresses and SLAAC
Date: Mon, 15 Jun 2020 14:01:59 -0700
In-Reply-To: <a17ae9f3-001c-07f6-84f9-a0ca583e6a00@gmail.com>
Cc: Bob Hinden <bob.hinden@gmail.com>, IPv6 List <ipv6@ietf.org>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
References: <e8a25961-5ac9-d35e-77dd-bf86f45cd077@gmail.com> <a17ae9f3-001c-07f6-84f9-a0ca583e6a00@gmail.com>
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Alexandre,

> On Jun 15, 2020, at 1:23 PM, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
> 
> Hi,
> 
> Before the sanitary situation I was studying an issue at ISO.
> 
> The issue is about 64bit MAC addresses and SLAAC.
> 
> SLAAC needs a 48bit MAC addresses in order to work, and it can not work with a 64bit MAC address; (but yes, it can with 64bit IIDs).

SLACC does not specify the length of the Interface ID, it does not require require 48-bit MAC addresses, and the reason for Modified EUI-64 Format Interface Identifiers in RFC4291 was to support 64bit EUI-64 Identifiers.   We have since moved away from using MAC addresses as Interface IDs.  See RFC 8064.

Bob


> 
> The document ISO/CD 22738:2019(E) under development at that time does specify a 64bit MAC address for optical camera communications (OCC, akin to IEEE 802.15.7).
> 
> This might be an additional requirement for SLAAC improvements.  Or not.
> 
> Alex
> 
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