IPv6 over IPv4 tunnels supported by the USG2000 and USG5000 series

The USG2000 series supports the following IPv6 over IPv4 tunnels:
IPv6 over IPv4 manual tunnels
IPv6 over IPv4 GRE tunnels
IPv6 over IPv4 automatic tunnels
6to4 tunnels
6RD tunnels
ISATAP channels

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