Re: 64bit MAC addresses and SLAAC

[Gyan Mishra <[e-mail]>]

On Wed, Jun 17, 2020 at 5:54 PM Philip Homburg <
[e-mail]> wrote:

> >   Of course the caveat there with unmanaged network and SOHO and Mobile
> >where manual or DHCPV6 is not possible or viable.
>
> Why is DHCPv6 not possible? Of course there is the Android problem.
> But I doubt that a low power IoT device would share a wifi-link with an
> Android device.


   I used use cases where the individual or unmanaged networks in those
cases may not have the expertise to setup dhcpv6

>
>
> >    In those cases SLAAC is preferred, but then we have the crux of
> >    issue and the decision tree on privacy random IID and its overhead
> >    if its not necessary versus modified EUI64.
> >    tree of course the underlying operational impacts of random
> >    versus  stable IID double edged sword operator or individuals
> >    decision to pick which works best for their use case.  In the
> >    end net-net is what is simplest to deploy and least overhead
> >    but also meets the desired goal is generally the thought for
> >    picking the IID generation solution. For that SLAAC wins out in
> >    that decision for the use case described above.
>
> A stable, unique pseudo random IID per prefix basically requires one
> SHA2-HMAC (or equivalent in SHA3 or other modern hash function) per
> prefix.
>
> I cannot imagine that computing 2 SHA2 hashes has a significant amount
> of energy use compared to link attachment and duplicate address detection.
>
> This computation is once per prefix, so it becomes an issue if the
> devices frequently attaches to new links. In which case tracking protection
> becomes important.
>
> I also wonder, a device that cannot afford a couple SHa2 hashes? Then that
> device is probably insecure and should not be connect to the internet
> anyhow.


   I don’t have the expertise on energy consumption issues on mobile but it
did appear from the thread that issues due exist with random over stable
IID.  Technically speaking I don’t understand why.

>
>
>
> --

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*Gyan Mishra*

*Network Solutions A**rchitect *



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