> | Granted
> | when a node did a DNS lookup, it wouldn't know if a given unique-local
> | address was in the same site,
>
> No, considering aggregated sites (with multiple I-Ds) but a simple compare
> of her site ID token against mine would catch the majority of cases.
>
It might catch the majority, but there would be enough that it wouldn't
catch that you'd need mechanisms similar to the ones used with site-locals
(ie, compare global prefixes to decide if you are in the same site, or even
have router advertisements or DHCP advertise the prefixes that are within
the site.") There'd also be the case where a node that was normally
reachable intra-site is temporally not reachable that way, but it reachable
through the global address, so you'd want to be able to catch that too.
So globally-unique-locally-routable prefixes aren't trivial to operate.
PF
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