ZyXEL Communications 200 Series - Manual (Page 431)

Chapter 26 L2TP VPN Example
ZyWALL USG 100/200 Series User’s Guide
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Figure 333 IP Security Policy Properties: Network Type
11 Select Use this string to protect the key exchange (preshared key), type password in
the text box, and click Next.
Figure 334 IP Security Policy Properties: Authentication Method
12 Click Add.