Disable network permanently

Question

I want to install an ubuntu System to an USB Stick and if I boot this, I don't want it to connect to the internet. Is there a Way to archieve this? I tried

sudo ifconfig eth2 down

But it is up again at the next restaret

Answer 1

Method #1 - from NetworkManager's Applet

Try disabling the wireless networking under the Network Applet that's accessible from under the icons in the upper right of your desktop.

                                                    

NOTE: The networking applet's icon looks like a triangle wedge. The image above is pointing to is as arrow #1. If you click it you should see a menu slide out from where you can disable wireless permanently, arrow #2.

Method #2 - /etc/network/interfaces

From the file /etc/network/interfaces you can specify that NetworkManager shouldn't control the wlan0 interface. To do so simply add this line to the above mentioned file:

iface wlan0 inet manual

Then restart NetworkManager:

$ sudo service network-manager restart

References

• How to disable built-in wifi and use only USB wifi card?

Answer 2

Add sudo ifconfig eth2 down in /etc/rc.local file so at login it will be down.

Answer 3

Just unplug your cable.

sudo ifdown eth2

Try it...