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CTL-ALT-T to open a crosh developer shell, enter the shell
crosh> shell
To see the list of network adapters:
% ifconfig -a
After my toying with my VPN settings, I had 4 extra tun devices, and it didn't seem as if chromeos has a cleanup script.
To delete the tunX devices, repeat for as many tun[?]:
% sudo ip tuntap del dev tun1 mode tun
If you accidentally delete tun0, connecting with chromeos VPN will restore it.