![]() ![]() That feature exists specifically to restore the older pre-switched LAN behavior: it designates one port as special, directing copies of all traffic to it, even packets not aimed at MAC addresses connected to that port. If you are on a wired LAN with managed switches and you have administrative access to those switches, you will probably find a feature you can enable in them called port mirroring. I should also note that wireless networking effectively behaves like LANs of old: every machine connected to a given Wi-Fi network can see all traffic, purely due to the nature of radio communication. Part of the Gigabit Ethernet spec is a requirement for switches. That can only be the case with 100 Mbit/s and slower networks. Now, maybe it is possible you are still on a hub-based Ethernet, or similar. (Switched Ethernet isn't a very good security measure, because it's easy to defeat with ARP poisoning.) Wireshark has the ability to capture all network traffic including packets and frames which can be reviewed in greater detail using a packet analyser tool such. ![]() This makes the network faster and slightly more secure. With switched Ethernet, the switch makes decisions about which packets to send to which ports. In those older technologies, every machine on the LAN saw all traffic, purely because they were all electrically connected to each other. The reason for this is that for years, most LANs have been built based on switched Ethernet technology, as opposed to hub-based Ethernet or bus-based networking. ![]() In all likelihood, it will only see traffic your machine is participating in, or which is broadcast to all machines. ![]()
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