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NATted network IPv4 network IPv6 network HA MN MN MN UDP/IP tunnel IPv6-IPv6 tunnel IPv4-IPv6 tunnel IPsec tunnel Solutions Register IPv4 address as a care-of address Outer tunnel is v4, inner is v6 Ability to setup various tunnels between MN and HA V6-over-v4 tunnel ESP tunnel UDP-encap-ESP tunnel IP-in-UDP tunnel GRE tunnel |