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Background Mobile IPv6 uses IPsec to protect messages exchanged between MN and HA as specified in RFC 3775, RFC 3776: Home Registration signals (BU/BA) Return Routability messages (HoTI/HoT) MIPv6 specific ICMPv6 messages (MPS/MPA) Payload packets SA pairs are necessary to be established between the MN and HA in static or dynamic manner Tunnel mode SAs are necessary to be updated whenever the MN performs movement |