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If you’re trying to set up a reliable way to route traffic to multiple EC2 instances across different regions using a single static IP address over a private network, there are some important things to consider.
AWS Global Accelerator provides static IP addresses that are anycast from the edge locations of AWS’s worldwide network. For IPv4, this means two static addresses, or four if you include IPv6. These addresses are used mainly to route public internet traffic through AWS’s global network, which helps improve performance and availability.
The challenge starts when your traffic is already on a private network, such as a Direct Connect connection, and doesn’t go through the internet or AWS edge locations in the usual way. Global Accelerator’s addresses are announced from edge locations that are part of the internet infrastructure, meaning they aren’t designed to work with private network links like MPLS or private peering.
This mismatch makes Global Accelerator less useful if you need a single static IP that routes traffic privately across regions. Instead, you might want to consider options like Elastic IP addresses assigned directly to your EC2 instances or load balancers inside your Virtual Private Cloud (VPC). These can be configured to manage routing over your Direct Connect connection.
Another approach is to set up Network Load Balancers or Application Load Balancers in each region with static IP addresses, then use DNS routing or custom traffic management systems at the application level to direct users to the appropriate resources.
The key point is that Global Accelerator is mainly built to optimize traffic that travels over the public internet via AWS’s edge locations. It isn’t really suitable for private network setups like Direct Connect. To manage traffic over private connections effectively, using dedicated internal IPs and load balancers tailored for private networking might be your best bet.
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