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3.1.6 Timer Events

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When the Retry Timer elapses, the new peer MUST send a new PATH_TEST message to the IPv4 address and port of the existing peer for which it is expecting a connection. This message MUST be sent from the same UDP port number on which it is expecting the connection. If fewer than the maximum number of attempts have been made, the timer MUST then be rescheduled so that it can elapse again. Otherwise, the retries have been exhausted and the Path Test operation SHOULD be canceled.