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. There is a current Wireshark issue open (18414: Version 4.0: failed to to set hardware filter to promiscuous mode) that points to a npcap issue: 628: failed to set hardware filter to promiscuous mode with Windows 11 related to Windows drivers with Windows 11. 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. My question is this: Capturing off the correct adapter in promiscuous mode yields all traffic from my laptop, plus some other traffic on my network (ie the wifes Dropbox, ARP, some TCP, etc.). I have understood that not many network cards can be set into that. I am studying some network security and have two questions: The WinPCap library that Wireshark (for Windows) is using requires that the network card can be set into promiscuous mode to be able to capture all packets 'in the air'. 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. Like a good boy I got Wireshark running on my laptop here at home to learn about all the packets that are flying by. Promiscuous mode on Windows - not possible 1. A question in the Wireshark FAQ and an item in the CaptureSetup/WLAN page in the Wireshark Wiki both mention this. ![]() 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. Yes, that's driver-dependent - some drivers explicitly reject attempts to set promiscuous mode, others just go into a mode, or put the adapter into a mode, where nothing is captured. ![]() ![]() There's promiscuous mode and there's promiscuous mode.
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