Comment by xx_ns
2 hours ago
> A probe packet contains the MAC address as well as the list of all the past Wi-fi networks that your device has tried to join before, which can reveal a lot about you!
Generally, most modern devices send broadcast/wildcard probes precisely to avoid leaking the PNL. From what I know, directed probes are only sent for hidden APs.
And most modern devices randomize MAC addresses ("Wi-Fi addresses" in Apple-ese, for probably obvious reasons) between networks, and even between broadcasts/connections to the same network.
I think this is only true for mobile devices? I'm curious how one would configure Linux to randomize MAC addresses by default.
macOS rotates MAC addresses between networks by default, and between connections to the same network unless it's password-protected. (It's under System Settings -> "Details..." or three-dot menu by a network -> "Private Wi-Fi address.")
Windows also randomizes by default as long as your network controller supports it.
It sounds like Linux requires some textual configuration that depends on your distro.
In Linux changing the MAC address can be done simply on the command line, so I'd probably just write this functionality into a bash script that I'd call before ifup.
https://fedoramagazine.org/randomize-mac-address-nm/
Correct. All major OSes stopped broadcasting the preferred SSID list by 2017, with Android and Linux being the last. Apple stopped in 2014. Windows by 2009.