Re: [dhcwg] I-D Action: draft-ietf-dhc-dhcpv6-pd-relay-requirements-00.txt

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>> A more specific rule for that is in 7084 and possibly in 3633, requiring a blockhole route on the requesting router for the delegated prefix.
> 
> But Tim is talking about BEFORE the PD is assigned?

See the sentence above the one you quoted.

> Do you know which requirement that is in 7084? My quick glance/search at the document did not turn up such a requirement? 

WPD-5.

> I doubt 3633 applies because that is only about PD and not what happens before PDs are assigned?
> 
> And as Tim raised it, seems likely that it must be happening frequently enough that whatever may be there is not clear enough?
> 
> Is there ever a case where a CPE should forward a packet received on the WAN interface back out the WAN interface? Probably not as it is designed to be router between the WAN and LAN interfaces only.

As I said, a CPE should not provide transit.
Not quite sure how you would best implement that though, so I'm unsure what the text should be. Perhaps something aking to this paragraph from 4443:

"One specific case in which a Destination Unreachable message is sent
   with a code 3 is in response to a packet received by a router from a
   point-to-point link, destined to an address within a subnet assigned
   to that same link (other than one of the receiving router's own
   addresses).  In such a case, the packet MUST NOT be forwarded back
   onto the arrival link."

Cheers,
Ole