Re: we should enable RFC7217 by default

W dniu 27.01.2026 o 21:55, Patrick M. Hausen pisze:
> HI all,
>
> Am 27.01.2026 um 21:46 schrieb Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>:
>
>> To narrow the impact, I suggest switching to the MAC address as the default key source instead of the interface name.
> If I read the relevant RFC correctly the main argument for stable addresses in contrast to
> traditional EUI-64 is the narrowing of the search space in sweep scan attacks.
> Because the OUIs which make up half of the order of magnitude are well known.
>
> Isn't that the case, too, if we start with the MAC address and the hash algorithm
> by which the final address is generated is public?
>
> Kind regards,
> Patrick
>
As far as I know, this is not possible with current computing platforms, 
and it would probably require prolonged observation of the same host 
across different subnets.

On the other hand, we still have EUI-64–based link-local addresses. 
Although they are not exposed to the Internet, they remain a concern.

-- 
Marek Zarychta