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HIP PATH Network Address HIP Initiator Server Translator Responder | | | | | I1 over IP | | | | ----------------> | I1 over UDP | I1 over UDP | | | ----------------> | ----------------> | | | | | | | R1 over UDP | R1 over UDP | | R1 over IP | with UDP-REA | with UDP-REA | | with UDP-REA | <---------------- | <---------------- | | <---------------- | | | | | | | | I2 over UDP | I2 over UDP | I2 over UDP | | with UDP-REA | with UDP-REA | with UDP-REA | | ------------------------------------> | ----------------> | | | | | | R2 over UDP | R2 over UDP | R2 over UDP | | with UDP-REA | with UDP-REA | with UDP-REA | | <------------------------------------ | <---------------- | | | | | | IPsec ESP | IPsec ESP | IPsec ESP | | over UDP | over UDP | over UDP | | <==================================== | ================> | Some HIP messages travel via the PATH server IPsec messages do not travel via the PATH server |