ZyXEL Communications VPN Series Handbook page 101

Security firewalls

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Then, configure the Secure Gateway IP as the Branch A's Gateway IP address (in

the example, 172.16.20.1). Type a secure Pre-Shared Key (8-32 characters) which

must match your Branch A's Pre-Shared Key.

Set Local Policy to be the IP address range of the network connected to the

Hub_HQ and Remote Policy to be the IP address range of the network connected

to the Branch A. Click OK.