Hi,

>> For IPv6, I'm not sure what they should do, but I have some ideas.  
>> Basically, the router should advertise as a default router with a single ULA 
>> prefix and a DNS server at the router's ULA interface address with RFC 6106 
>> and optionally RFC 3736.  When the DNS query signals PPPoE to establish the 
>> WAN link, the DHCPv6 client will ask for a IA_PD and update the prefix 
>> advertised on the LAN accordingly.
> 
> "Update" or just advertise the new global prefix alongside the ULA?

Alongside. The ULA addresses should be stable so that they can always be used 
internally, independent on the link to the ISP.

- Sander

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