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I chose to add another nic for VMs and plug them into the wan bridge.
I have done that before, wanted something simpler.
Look into Proxy NDP (I believe pfSense supports it). Essentially what it will do is have your pfSense WAN interface re-advertise neighbor discovery packets received on the LAN interface.
Looking and can't find much.
Did a quick search and found this: https://forum.pfsense.org/index.php?topic=98020.30 looks like pfsense doesn't support proxy NDP. Your best bet is probably a bridge in this case, or see if your provider can route your IPv6 subnet to your pfsense VM.
I think I just need to use shorewall instead: http://shorewall.net/manpages6/shorewall6-proxyndp.html
With Kimsufi I'm running some IPv6 and NATv4 inside Proxmox, and I'm using npd6 to work with neighbor solicitation requests. I've written down the procedures for my own record, but it may not directly apply to your situation. Try with caution.
Did anyone get this working?
I use ndppd sometimes on proxmox at kimsufi. The other option if you can live with fewer ipv6 is to use systemd-networkd's built in way of doing this
So above works fine, but when you need a bigger subnet use ndppd. I found auto to not work always, but static works "fine". It will warn you about the subnet size being to big but /shrug .
I got it working with PFSense. I forgot the specific configs I used to get it working, but it was eventually possible.