A few days ago we published a post on how to find out whether or not we have intruders on our wifi network. Apparently many of you have had problems initializing the commands.
If you look at the commands to write for the wifi network scan to begin, we see that in the end we put wlan0, this is the name or reference that Ubuntu uses to refer to the wireless device.
If your Ubuntu system has named it something else, simply putting wlan0 won't do any good. To do this, as recommended by X-Mint, with the command iwconfig, the console will show us all the communication devices and their name, if we only have one Wi-Fi device it will be a matter of looking for the name and replacing it with wlan0.
Regarding the update problem, it is not a question of the program but of the theory. When we perform an update, it first connects to the server to download the packages to install and once downloaded, everything is disconnected and the update is installed. In general, it is the operation of many tablets and smartphones, so possibly when the mobile device was scanned it was not really connected to our Wi-Fi network.
The other point that I would like to clarify is the usefulness of these commands. I know that current routers detect intruders, but unfortunately not all of us have the latest routers. In addition, this scan provides us MAC address that we can copy with the mouse and paste in any blacklist or firewall, this will be safe and there will be no risk of confusing us.
Steps to follow if we detect someone on our Wi-Fi network
In addition, for many, these commands will only serve to warn the presence of intruders. Once the presence is detected, I recommend doing the following:
- Change the SSID name.
- Enter a long password with numbers, which refers to personal but not sensitive data. That is, put something like the name day of an important event in our lives but no mobile phone numbers, or enter the DNI, or anything like that.
- Change the type of security and encryption.
- Use a firewall like ufw.
- Eject the MAC address of the wifi network. This would be ideal to do from the router, but there are firewalls that make it easier for you without having to manipulate the router's configuration.
- IF the problem still persists, we can use legal mechanisms, although this is more expensive and difficult to achieve.
I hope that with this the last tutorial makes more sense and people have less problems, you can still comment, any comment, positive or negative, is appreciated, always help the reader and have another point of view.