ZyXEL Communications USG-100@USG-200 - V2.20 ED 2 Manual page 193

Enter the domain name or WAN IP address configured as the My Address in the
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VPN gateway configuration that the ZyWALL is using for L2TP VPN (172.16.1.2 in
this example).
For the Destination Name, enter L2TP to ZyWALL.
Select Don't connect now, just set it up so I can connect later and click
Next.
Figure 161 Connect to a workplace: Type the Internet address to connect to
Enter the user name and password of a user account that can use the L2TP VPN
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connection and click Next.
Figure 162 Connect to a workplace: Type your user name and password
ZyWALL USG 100/200 Series User's Guide
Chapter 8 L2TP VPN Example
193