What are limitations and precautions for IPv6 over IPv4 tunnels.

Limitations and precautions for IPv6 over IPv4 tunnels are as follows:
-Dynamic routing protocols supported by IPv6 over IPv4 manual tunnels are RIPng, OSPFv3, and BGP4+.
-Dynamic routing protocols supported by IPv6 over IPv4 GRE tunnels are RIPng, OSPFv3, and BGP4+.
-Dynamic routing protocol supported by IPv6 over IPv4 automatic tunnels is BGP4+.
-Dynamic routing protocol supported by 6to4 tunnels is BGP4+.
-Dynamic routing protocol supported by 6RD tunnels is BGP4+.
-Dynamic routing protocol supported by ISATAP tunnels is BGP4+.

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