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I would like to give an ubuntu pc to my children. And since they are quite young (5 and 7) I would like to shut down the Wifi completely for them. However, to update the pc and download applications, I have to activate it from time to time. And then, it remembers the password and connects automatically. Is there a way to either disable the remembering of the wifi-password (I dont want to disable the password-manager completely) or to attach an extra "lock" to it, eg by unmounting/mounting the wifi-adapter with a password? Thanks for your help.

Verstehnix
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  • what about hidden SSID? not interested? – PRATAP Oct 19 '19 at 14:53
  • `nmcli radio wifi off` startup application? – PRATAP Oct 19 '19 at 14:54
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    Possible duplicate of [How to lock down connecting to a specific WiFi](https://askubuntu.com/questions/590923/how-to-lock-down-connecting-to-a-specific-wifi) – graham Oct 19 '19 at 14:55
  • Would it be possible to connect PC by wire once a week or every two weeks for updates? – crip659 Oct 19 '19 at 15:31
  • You could setup a user ID for your children (no WiFi) and a user ID for yourself (all privileges including WiFi). This could help them from damaging system too if they were non-sudo user. – WinEunuuchs2Unix Oct 19 '19 at 15:46
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    Just something to think about, I was fixing(simple fix) my parents hi-fi turntable at that age. – crip659 Oct 19 '19 at 16:23
  • Thnaks for all the comments! We solved it now as WinEunuchs2Unix suggested and set a second ID for them. In fact, the argument that we can easily repair any damage convinced us most. – Verstehnix Oct 21 '19 at 18:28

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You can use iptables with the owner module , just for their user. The wifi will work for the rest of the system and for all other users. The syntax is:

iptables -A OUTPUT -o wlan0 -m owner --uid-owner USERNAME -j DROP

That would drop all output packages to wlan0 for user USERNAME, effectivly killing internet for them.

Eduardo Trápani
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