Re: [STDS-802-Privacy] using only 24 bits of random MAC

[Paul Lambert <paul@xxxxxxxxxxx>]

On Wed, Oct 1, 2014 at 1:24 PM, Paul Lambert <paul@xxxxxxxxxxx> wrote:

Using a OUI with local bit is unnecessary and again increases collisions.

I'm part of the team that will be helping test this at the upcoming IETF meeting. A reason to set the local bit is so we can treat these MAC addresses differently from "persistent" MAC addresses in the DHCP server--giving out shorter leases for MACs with the local bit set. Otherwise, we're likely to run out of IPv4 address pool space.

I think this will be an operational issue for the large scale deployment of this technology, so I encourage you to rethink the usefulness of setting the local bit. I think we can afford that one bit.

Sorry for any confusion calling a CID an OUI … Yes, I also advocate use of the ‘local bit’.  All 46 bits of the local address space using the local bit should be used for uniformly distributed  addresses.

CID is unnecessary and has negative impacts including: smaller address space, possible leakage of privacy (by multiple identifiable CIDs)

Paul

Chris.

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Chris Elliott
chelliot@xxxxxxxxx