ZyXEL Communications 200 Series - Manual (Page 434)

Chapter 26 L2TP VPN Example
ZyWALL USG 100/200 Series User’s Guide
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Figure 339 IP Security Policy Properties: IP Filter List
17 Select Require Security and click Next. Then click Finish and Close.
Figure 340 IP Security Policy Properties: IP Filter List
18 In the Console window, right-click L2TP to ZyWALL and select Assign.
Figure 341 Console: L2TP to ZyWALL Assign