Google "ettercap" if you wish to pursue that angle. I'm ignoring for the purposes of this discussion tools like ettercap which would allow you to poison a given switch CAM table to re-direct certain traffic so that you can see it. If you define 'network' as everything in your building or campus, then it becomes a much more difficult proposition, and would generally require access to resources on other switches not commonly available to the average end-user. In other words, an IG bit of 0 indicates that this is a unicast MAC address, an IG bit of 1. The IG bit distinguishes whether the MAC address is an individual or group (hence IG) address. It refer to 'IG bit' that is present in the Ethernet Frame. I can then use Wireshark to see packets from the ESP32s MAC address, and the packets obviously contain the data I am sending. My software is dumping the Wifi MAC address which I see in monitor. For information on SPAN ports, see the documentation provided by the switch vendor. With Wireshark (2.2.6 version for Linux) is possible to choose the filter ' eth.ig 1 '. Ive just about exhausted everything without success. Simply fire up wireshark, select the network interface in use, and click "start". In either case, wireshark will by default capture both the IP and MAC addresses of all the traffic that it sees. You probably want to disable name resolution to see the actual values instead of the resolved OUIs or domain names. If you're talking about your local broadcast domain, you may be able to 'mirror' all traffic transiting your local switch over to a 'SPAN' port on that switch and monitor all the traffic there using wireshark. As hangsanb alluded to, you can use Wiresharks Statistics -> Endpoints, then choose the Ethernet tab for a list of unique MAC addresses, and choose the IPv4 (or IPv6) tab for the list of unique IP addresses. Normally, if you run wireshark on your own computer, you will only see your own traffic, between your computer and the switch. It depends almost entirely on how you define "network".
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