Communication between the public subnet and the private subnet of different VPCs

Question

We have 2 VPCs, VPC A and VPC B. Each VPC has a private subnet and a public subnet connected via NAT. There's a peering connection between the private subnets of VPC A and VPC B. Most of our ECS services are inside the private subnet but some are in the public subnet. Now a service X in the public subnet of VPC A is able to communicate with the service Y in the private subnet of VPC A. We also have a service Z inside the private subnet of VPC B, which currently is unable to communicate with service X. How to make service X to communicate with service Z without using Transit Gateway or Private Link?

Thanks, PH

Thanks,
PH

Gary Mclean · Accepted Answer

You have VPC Peering. All Subnets in both VPCs can talk to each other using their Private IP Addresses.
Theres nothing that needs doing apart from ensuring theres no ACLs that block traffic, and the security groups allow traffic.

Other thing to check is if your using the AWS DNS Names, enable inbound DNS resolution on the VPC Peering connections otherwise they may resolve to Public IPs.

Communication between the public subnet and the private subnet of different VPCs

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