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Secondary Gateway policy (USG1 wan2 to USG2 wan2)
My Address: wan2, Peer Gateway Address: 192.168.4.33
Pre-Shared Key: 12345678
b. Add two VPN Connections
First VPN Connection
Enable Nailed-Up
Application Scenario: Site-to-Site
VPN Gateway: GRE0_GW
Local policy: 192.168.1.33
Remote policy: 192.168.3.33