ZyXEL Communications VPN Series Handbook page 246

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Now the rule is configured on the ZyWALL/USG. The rule settings appear in the VPN >
L2TP VPN screen. Click Close to exit the wizard.
Quick Setup > VPN Setup Wizard > Welcome > VPN Settings > Wizard Completed
Go to CONFIGURATION > VPN Connection > Create new Object > Create Address,
create an address object as the NAT router's WAN IP address (in the example,
172.100.20.30).
CONFIGURATION > VPN Connection > Create new Object > Create Address
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