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AWS: One VPC with multiple VPN connections to different sites. What about CIDR overlaps?

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http://serverfault.com – So, I have an app running in a VPC, with (currently) a VPN connection to the development location. The app is accessible at, let's say, 10.0.2.25 (IP of the internal ELB, accessible only via VPN). The VPN-capable router I have (aka. client gateway) has no BGP capabilities. The CIDR of the network I'm on (client network is 192.168.1.0/24) and on the VPC there is a Virtual Private Gateway (vgwA) and a corresponding routing rule (Destination 192.168.1.0/24; Target wgwA). I can access the app without any problem (all ACL/Security Groups are properly configured). My question is what happens whe (HowTos)