ZyXEL Communications ZyWALL USG100-Plus User Manual page 88

Chapter 4 Create Secure Connections Across the Internet
11 Select Optional encryption (connect even if no encryption) and the Allow these protocols
radio button. Select Unencrypted password (PAP) and clear all of the other check boxes. Click
OK.
12 Click IPSec Settings.
13 Select the Use pre-shared key for authentication check box and enter the pre-shared key used
in the VPN gateway configuration that the ZyWALL is using for L2TP VPN. Click OK.
14 Click Networking. Select L2TP IPSec VPN as the Type of VPN. Click OK.
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ZyWALL USG100-PLUS User's Guide