Hi,
Your need is to install a router that will distribute IPs to other VMs that behind this router in IPv6, you mentioned pfsense, I can propose you a router software that is very handy and best than pfsense and easy to manage.
I have many years of managing networks and system administration and in ISP world, I managed an internet backbone and several datacenters including several Xen Servers , Vmware, OpenVZ.
We can start step by step as below :
- Install the Pfsense or the router that I will propose to you
- Configure the necessary IPs into the router
- Create a VM to test with the router
A document will be wrote to you for all the steps with screenshots.
Please contact me for further information.
I can do this work for you
Thanks