In some situations you need to fake / change / spoof a MAC address of your network interface. macchanger Linux command does this job in no time. With this tool you can change your mac address of any Ethernet network device wired or wireless.
Lets say IF the hotel you are at let each device use the internet for a limited amount of time, they must have a way of identifying each device. And a router tells devices apart is by their MAC addresses. Fortunately for us, we can change our MAC address easily.
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A user has reported that the wifi passwords are not encrypted on Ubuntu systems, being stored in clear text in a folder outside the user’s home, (/etc/NetworkManager/system-connections/) making it accessible for unwanted users.
After this issue has been reported, a Canonical developer has explained in the mailing lists that this is caused by the fact that the “All users may connect to this network” option is enabled by default.
This issue has an easy fix, directly from the graphical user interface. All you have to do is: Open network indicator -> Edit connections -> Select network -> Click edit -> untick “All users may connect to this network.” from the general tab.
By doing this setting, the password will be stored in the user’s home and so, it will become unavailable for unwanted users. Also, encrypt your homedir, for better security.