I'm trying to set up routing for an EC2 instance in Account A to access resources available through a PrivateLink in Account B. My EC2 instance in Account A has an internet gateway with routing that allows all instances to connect with each other. What specific infrastructure or rules need to be configured in Account A to ensure that traffic is directed correctly to the PrivateLink endpoint in Account B? Do I need route table entries, or is it necessary to create a VPC PrivateLink in Account A that connects to the one in Account B?
2 Answers
To access the PrivateLink from Account B, you need to create an AWS PrivateLink endpoint in Account A that points to the PrivateLink service in Account B. This endpoint will use IP addresses from the subnets you select in Account A. Make sure to also set the necessary security group rules to allow traffic from your EC2 instance to the PrivateLink. It's generally best if your VPCs in both accounts are in the same region and ideally in the same Availability Zones to avoid extra data transfer costs.
In addition to setting up the PrivateLink, yes, you will need to update the route table in Account A. Ensure that your EC2 instance's route table has a route pointing to the PrivateLink endpoint in Account B. This will help route the requests properly. Just ensure that the security groups on both ends allow for the traffic you're trying to send.
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