ZyXEL Communications ZyWALL 110 Handbook page 301

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Then, configure the Rule Name and set My Address to be the wan1 interface which is
connected to the Internet. Type a secure Pre-Shared Key (8-32 characters).
Quick Setup > VPN Setup Wizard > Welcome > VPN Settings
Assign the L2TP users' IP address range from 192.168.100.10 to 192.168.100.20 for use in
the L2TP VPN tunnel and select Allow L2TP traffic Through WAN to allow traffic from L2TP
clients to go to the Internet. Click OK.
Quick Setup > VPN Setup Wizard > Welcome > VPN Settings (L2TP VPN Settings)
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