Working with local gateways

Our EC2 instance is now running on AWS Outposts and is capable of communicating with the other subnets in VPC and also with the internet because it has a public IPv4 associated with it. So, what role does the local gateway play?

The local gateway (LGW) is the networking construct that allows your Outpost to communicate with the customer network, and it only exists in the rack. Outposts servers use the Local Network Interface (LNI) to communicate with the local network.

Only one LGW is created per Outpost and it can be attached to multiple VPCs within the Outpost; it operates in a Network Address Translation (NAT) fashion. This feature can add additional latency to the network traffic in extreme conditions. It’s a best practice to interact with AWS teams to assess the limitations of this structure under stress conditions and make sure it will meet your architecture requirements.

During the installation process, another type of route table...