Re: Understanding IPv6-PD over PPPoE

On 16/06/2021 09:43, Andrei Borzenkov wrote:

It is explicitly prohibited to assign any IA_PD prefix to the same
interface via which this was obtained.

                                               the requesting router MUST
    NOT assign any delegated prefixes or subnets from the delegated
    prefix(es) to the link through which it received the DHCP message
    from the delegating router.

[...Which is from RFC 3633]

That's a pain. It basically makes it impossible for a single-NIC machine to connect to an ISP that is only responding to IA_PD. (Well, you can obviously set up a dummy NIC, which can be assigned a prefix, but that's a kludge).

I can see why you wouldn't want a whole /64 to be assigned to an ethernet interface that received the DHCPv6 Advertise, but it does feel reasonable to be able to *optionally* assign a /128 to the point-to-point link that received the DHCPv6 Advertise, if there is no other way to assign a global address to it.

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