AWS Transit Gateway + VPN - Amazon Virtual Private Cloud Connectivity Options

AWS Transit Gateway + VPN

AWS Transit Gateway is an AWS managed high availability and scalability regional network transit hub used to interconnect VPCs and customer networks. AWS Transit Gateway + VPN, using the Transit Gateway VPN attachment, provides the option of creating an IPsec VPN connection between your remote network and the Transit Gateway over the internet, as shown in the following figure.

Figure 3 - AWS Transit Gateway and VPN

Consider using this approach when you want to take advantage of an AWS-managed VPN endpoint for connecting to multiple VPCs in the same region without the additional cost and management of multiple IPSec VPN connections to multiple Amazon VPCs.

AWS Transit Gateway also supports and encourages multiple user gateway connections so that you can implement redundancy and failover on your side of the VPN connection as shown in the following figure.

Figure 4 - AWS Transit Gateway and Redundant VPN

Both dynamic and static routing options are provided to give you flexibility in your routing configuration on the Transit Gateway VPN IPSec attachment. Dynamic routing uses BGP peering to exchange routing information between AWS and these remote endpoints. With dynamic routing, you can also specify routing priorities, policies, and weights (metrics) in your BGP advertisements and influence the network path between your networks and AWS. It’s important to note that when you use BGP, both the IPSec and the BGP connections must be terminated on the same user gateway device, so it must be capable of terminating both IPSec and BGP connections.

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