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Hello.
It is possible to use the same customer gateway device.
This can be done by creating another Customer Gateway with the same IP address and creating a VPN connection.
https://docs.aws.amazon.com/vpn/latest/s2svpn/your-cgw.html#your-cgw-multiple-connection
Multiple VPN connections using the same customer gateway device You can create additional VPN connections from your on-premises location to other VPCs using the same customer gateway device. You can reuse the same customer gateway IP address for each of those VPN connections.
Hello, That's the expected behavior; if you use the same virtual private gateway (VGW) and the same customer gateway (CGW), it will give you an error. However, if you want to use the same target gateway and customer gateway, you can use Transit Gateway as an option and same Customer Gateway to create two VPN connections.
