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NAT Traversal IKEv2 supports NAT Traversal MN will know whether there is NAT in a visiting network before sending BU If NAT detected, and, If IPsec used for payload traffic, use UDP encapsulation for ESP packets If IPsec is not used, use IPv6-in-UDP-over-IPv4 tunneling Might be useful to develop a alternate MIP6 specific mechanism Similar to MIPv4 NAT detection mechanism HA detects NAT by observing difference between IPv4 source address on outer tunnel and the IPv4 CoA |