The type of packet captured by this interface. TrafficĪ sparkline showing network activity over time. This will be indicated by a configuration iconĬlicking on the icon will show the configuration dialog for that interface. See the Wireshark Wiki's page on Wi-Fi capture setup for information on monitor mode and the Wireshark Wiki's "how to decrypt 802.11" page for information on that topic.Some interfaces allow or require configuration prior to capture. If you're capturing on Wi-Fi, promiscuous mode might not do anything at all - you'd need to capture in monitor mode, and set up Wireshark to be able to decrypt traffic if it's a "protected" network using WEP, WPA, WPA2, or WPA3.If you're capturing on an Ethernet that's on a switched network, promiscuous mode isn't sufficient to capture other machine's traffic, because that traffic probably isn't going to be sent to your switch port see the Wireshark Wiki's page on Ethernet capture setup for more information.Therefore, neither tcpdump nor Wireshark will, when capturing in promiscuous mode, cause ifconfig to show "PROMISC". Libpcap uses the second mechanism if it's available tcpdump and Wireshark both use libpcap to do packet capturing, so they'll use the second mechanism on any Linux system with a 2.2 or later kernel. In the 2.2 kernel (i.e., a long time ago), a second mechanism was added that mechanism does not set the IFF_PROMISC flag, so the interface being in promiscuous mode does not show up in the output of ifconfig, and it does not require promiscuous mode to be turned off manually - closing the last descriptor on which promiscuous mode was requested suffices. Originally, the only way to enable promiscuous mode on Linux was to turn on the IFF_PROMISC flag on the interface that flag showed up in the output of command such as ifconfig. There's promiscuous mode and there's promiscuous mode.
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