ZyXEL Communications VPN Series Handbook page 330

Save default certificate as *.crt file to Android mobile phone computer.
Set Up the L2TP VPN Tunnel on the Android Mobile Device
1
To configure L2TP VPN in Android, go to Start > Settings > Network & Internet >
VPN > Add a VPN Connection and configure as follows.
2
VPN Provider set to Windows (built-in).
3
Configure Connection name for you to identify the VPN configuration.
4
Set Server name or address to be the ZyWALL/USG's WAN IP address
(172.124.163.150 in this example).
www.zyxel.com
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