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AWS recommends using VRFs when connecting a single customer gateway to multiple Amazon VPCs because the VPN connection creation logic is designed to ensure unique tunnel IP addresses for each connection within a single VPC, but not necessarily across multiple VPCs.
When implementing multiple VPC connections from a single customer gateway without VRFs, customers must be aware that VPC does not guarantee unique tunnel and Border Gateway Protocol (BGP) peer IP addresses. As a result, it is possible that these addresses automatically generated for one VPC may be duplicated when creating connections to another VPC.
To connect a firewall to your AWS VPC, a matching VPN policy must be configured on the Dell SonicWALL Security
Appliance. A tunnel interface is created by configuring a VPN policy of type Tunnel Interface on a physical
interface from the firewall to the remote AWS gateway
VPC requires a customer gateway to configure 2 route based VPN tunnels for each instance of dynamic route
based VPNs at VPC. So there needs to be 2 tunnel interface VPNs and 2 tunnel interfaces, each with its own BGP
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