Here you will find how to setup L2TP/IPsec VPN protocol on iPad. Setting up HeadVPN access under iPad is simple. The following instructions go step-by-step through the creation process of a L2TP/IPsec VPN connection.
Go to the Settings (1)

Go to General (2). Scroll down and select VPN (3)

Press Add VPN Configuration…

Press on Type (4)

In opened sub-menu select L2TP then press Back.

For Description add any name you want, for ex: HeadVPN L2TP (5)
In the Server field type the host name or IP address of a HeadVPN server you want to connect, for ex. uk1.headvpn.com (6)
For Account enter your HeadVPN username. (7)
Leave disabled RSA SecurID
For Password enter your VPN password. (8)
Secret: headvpn (9)
Enable “Send All Traffic”
Press Done

Now you can connect/disconnect to the VPN (10).
You are DONE !

Enjoy HeadVPN service!