[IPv6]Re: [v6ops] Re: Re: Android now supports DHCPv6 PD

[Ondřej Caletka <[e-mail]>]

On 16/09/2025 16:31, Mark Smith wrote:
> Doesn't this clause cover that?
>
> "This includes for example letting visitors connect to the assignment 
> holder's network"
>
> A guest Wifi network (as in "guest of the current network") would be 
> attached to the assignment holders network wouldn't it?

No, not for prefix delegation. The quoted sentence is just an example of 
what is not considered a sub-assignment based on previous sentence. This 
example was written when no such thing as PD-to-device existed and 
therefore all guest Wi-Fi networks were giving out only individual 
addresses to the connected devices. The previous sentence is however 
pretty clear and could be considered normative:

> Providing another entity with separate addresses (not prefixes) from a 
> subnet used on a link operated by the assignment holder is not 
> considered a sub-assignment.

The bracketed "(not prefixes)" makes it clear that only giving separate 
addresses (like when using SLAAC/DHCP-IA) is NOT considered a 
sub-assignment. When you start giving out prefixes, the sentence does 
not apply and therefore you are making sub-assignments, which is not 
allowed.

(Well strictly speaking, purely from the logic point of view, just the 
fact that the sentence does not apply does not imply that the opposite 
applies, but I am pretty sure this is the intended spirit of this policy.)

--
Ondřej