DMVPN uses GRE tunnels and is capable of tunneling multiple protocols. Enhancements to NHRP added support for IPv6 so that multipoint GRE tunnels can find the appropriate IPv6 address. This means that DMVPN supports the use of IPv4 and IPv6 as the tunnel protocol or the transport protocol in the combination required.
All the concepts and commands explained in Chapter 3, “Dynamic Multipoint VPN,” have an equivalent command to support IPv6. Table B-1 provides a list of the tunneled protocol commands for IPv4 and the equivalent for IPv6.