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RE: draft-bourbaki-6man-classless-ipv6-00

"Manfredi, Albert E" <albert.e.manfredi@boeing.com> Tue, 13 June 2017 18:47 UTC

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From: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: 6man WG <ipv6@ietf.org>
Subject: RE: draft-bourbaki-6man-classless-ipv6-00
Thread-Topic: draft-bourbaki-6man-classless-ipv6-00
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Date: Tue, 13 Jun 2017 18:46:58 +0000
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-----Original Message-----
From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com] 

> Also see Gengyu Wei's message: when devices roam, what happens
> if the LL IID length for a given interface is supposed to change?
> DIP switches again?

Yes, the IID length would change, but this can easily be without use of DIP switches. It changes dynamically, with a new prefix length offered in the RA.

> It doesn't matter. If it isn't backwards compatible with
> deployed code, IMHO it isn't going to happen on Ethernet or
> Wi-Fi.

I remember first setting up my workstation, at work, for DHCP, as a guinea pig for the rest of the office. No problem. All the other hosts continued to work just fine. This would be backward compatible, in the sense that existing hosts would only be able to use 64-bit prefix lengths in RAs, to configure SLAAC. No problem. You can either continue to offer a 64-bit prefix length, for legacy hosts to use SLAAC, or you can stop offering 64-bit IIDs, and legacy hosts would be unable to configure SLAAC addresses.

Bert

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