ZyXEL Communications ZyWALL 110 Handbook & Instructions page 107

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5 Go to CONFIGURATION > Network > Interface > VTI > Add to create a VTI for
the VPN tunnel BO1. Be aware that the IP address of this VTI must be in the
same subnet as vti1 on USG1.
In this example, the IP address and subnet mask of vti1 on USG1 is 10.10.10.10
and 255.255.255.0 respectively. The IP address of vti1 on USG2 must be in the
subnet of 10.10.10.0/24. Enable the connectivity check. Enter the IP address of
vti1, which is configured on USG1.
CONFIGURATION > Network > Interface > VTI > Add
CONFIGURATION > Network > Interface > VTI > vti1 > Connectivity Check
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