The GM returns a Delay_Resp Message with an accurate time stamp of the Delay_Req Message arrival back to the slave. Next a Delay_Req Message is sent by a slave clock to the GM. A Follow_Up Message which carries an accurate time stamp of the Sync Message departure time follows from the GM in a two-step operation. The first message is called a Sync Message sent from a GM to a multicast IP address (check the Destination column). What we see in the main screen marked yellow is a two-step PTP message sequence between a master and a slave. showing a successful transfer of PTP messages between a Grandmaster and a slave in the multicast mode. Now you are able to visualize PTP timing packages in a closer detail (Figure 2).įigure 2: A print screen in Wireshark v1.8.6. After a while stop the running session with a Stop button (the forth icon in the second row). Start a new live capture by clicking “Start” in the Capture menu. Get my full Wireshark Course for 10 here. In the filter area (see Figure 2) type “ptp” and the data packages displayed will be limited to PTP messages only. In this Wireshark Tutorial, I demonstrate how to install Wireshark and then capturing packets with Wireshark. The network interface listens to all network protocols coming in and out including PTP. In Wireshark go to the “Capture menu -> Interfaces” and select the laptop network port attached to the test setup. For those who are not yet familiar: Wireshark is a user-friendly network protocol analyzing tool and free downloadable.įigure 1: Hands-on setup to prove compatibility of the IEEE 1588 Default Profile configuration of a master and a slave clock. At this time I will grant you a short summer break from all the theory □ and we will do some hands-on refreshment instead! Let’s check if PTP messages between a GM (Grandmaster) and a slave clock both configured with the Default profile are transferred smoothly.įor this purpose attach a laptop with a Wireshark software in a test bed with a GM and a PTP slave as suggested in Figure 1.
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