To set up L2TP over IPsec with PSK on Chromebook
Click the status area at the bottom of your screen, where your account picture is located.
Select Settings
In the "Internet connection" section, click on Add connection
Select Add private network.
In the box that appears, fill in the information below
Server hostname: Enter a server hostname from the list here
Service Name : SwitchVPN
Provider type: select "L2TP/IPsec + Pre-shared key"
Pre-shared key: switchvpn
Server CA Certificate: Select Default
User certificate: Select None Installed.
Username: Enter your SwitchVPN user name.
Password: Enter your SwitchVPN password.
Click on Connect