Operating System - ZyXEL Communications ZyWALL 110 Handbook

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Set Up the L2TP VPN Tunnel on the Apple MAC OS X 10.11 El
Capitan Operating System
To configure L2TP VPN in OS X 10.11 operation system, go to System Preferences...
> Network, click the "+" button at the bottom left of the connections to add a new
connection and configure as follows.
Set the Interface to be VPN, select VPN Type to be L2TP over IPSec.
Configure Service Name for you to identify the VPN configuration. Click Create.
Configure Server Address to be the ZyWALL/USG's WAN IP address
(172.124.163.150 in this example). Enter Account Name which should be the same
as Allowed User created in ZyWALL/USG (L2TP_Remote_Users in this example). Then,
click Authentication Settings....
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