Airport Wifi

Many “free” wifi hotspots give you a limited time per computer. If you’re traveling light and forgot to bring extra devices, it’s easy to give a Linux laptop multiple personalities:

$ ip link
    1: lo
    2: wlp4s0
    3: enp0s25
$ ip link set dev wlp4s0 down
$ macchanger -r wlp4s0
$ ip link set dev wlp4s0 up

... And then connect to the wifi and jump through its silly captive portal hoops again!

Changing your MAC address occasionally can be part of a healthy security diet, making your device slightly more difficult to track, as well.