ZyXEL Communications VPN Series Handbook page 803

2. Select remote VPN scenarios, ZyXEL VPN Client(SecuExtender IPSec) or L2TP over
IPSec client (IOS, Windows,Android). Here is an example of L2TP over IPSec VPN
deployment.
3. Configure the VPN configuration
(1) Enter the Pre-Shard Key
(2) Choose the Incoming interface
(3) Select the tunnel type, L2TP over IPSec VPN only support full tunnel type.
Enable the check box of "Allow L2TP traffic Through WAN".
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