I discussed in a previous article the necessity of abandoning IPv4 thinking when creating IPv6 address designs, and how our deeply ingrained need to conserve addresses can muddle our thinking. Nowhere does this conservative aversion to address waste snarl at us as menacingly as when we consider – completely compliant with the recommendations of ARIN and other RIRs – assigning /64 subnets to point-to-point links.
You've acquired a nice new IPv6 address block, and now you need to come up with an IPv6 address allocation design for your network. If there is one bit of advice I can offer you as you begin your IPv6 address design, it's this: Abandon almost everything you've learned about IPv4 address design. Throw it right out the window.