I assume you will be rolling out a dual stack so I can still use my IPv4 VPN until I'm ready to switch to an IPv6 VPN. I'll have to run a dual stack at the home office since I have 150 branches with numerous ISP's. I'm assuming I can pass IPv6 traffic through the IPv4 IpSec VPN but don't know for sure. I know my Vyatta router here has that capability.
Let me think about it.
Thanks again for your help.