I'm working on IPv6 only setup in my clusters, and I prefer to use SIIT-DC to not have NAT44 type gateway "funs", I ran into the funs w.r.t. greylisting and SFP checks.

Q1: Is there a method to have a specific netblock (the NAT46 block with the lower 32bits encoding the source IPv4) greylisting on /128 while I have the rest greylisting on /64 ?

Q2: what is the possibility of having PMG use the NAT46 block to get/find the source IPv4 to use to check for SPF/etc. information? Refer RFC 7755

Q3: What other IPv6 only funs might I hit going this route?

Q4: plans for future IPv6-only PMG support?

Q5: I noticed som XCLIENT and some PROXY protocol, is that a feasible option to use at the edge to then proxy to the IPv6only PMG hosts?