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Hello.
Remote and Local IPv4 network CIDR's
What you want to know is the CIDR set on the screen below in the AWS management console?
If so, please set the on-premises CIDR for "Local IPv4 network CIDR".
There is no problem if you set the AWS VPC CIDR for "Remote IPv4 network CIDR".
This is a CIDR setting that allows the VPN tunnel to pass through, so if you set it to 0.0.0.0/0, all communications will be able to pass through.
If there is no need to limit it, I think you can set it to 0.0.0.0/0.
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Are there security risks to setting it to 0.0.0.0/0? Because when we set the Local and Remote IPv4 network CIDRs to our correct CIDRs, the tunnels didn't work (because I think the BGP peering traffic wasn't captured)