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Inter-Operability |------->| IKE_SA_INIT and IKE_AUTH to protect Initial SCCRQ |------->| SCCRQ (Fixed IP address, Dynamic Initiator Port) |<-------| STOPCCN (SC chooses new IP address) |------->| New IKE_SA_INIT and IKE_AUTH to protect New SCCRQ |------->| SCCRQ (SCCRQ to SC’s new IP address) |<-------| CREATE_CHILD_SA to change port number by SC |<-------| SCCRP (SC chooses new port number) |------->| SCCN (L2TP Tunnel Establishment completes) SI SC |