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How do I troubleshoot problems establishing communication over VPC peering?
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I can't establish communication between my Amazon Virtual Private Cloud (Amazon VPC) over VPC peering. How can I resolve this?
Short description
VPC peering network connectivity failures might occur due to incorrect or missing route tables, firewall rules, or DNS (if applicable). To route traffic between VPCs in a peering connection using private IP addresses, the VPCs must be able to communicate with each other as if they are in the same network.
Use VPC flow logs to verify that the required traffic isn't rejected at the source or destination. This rejection might occur due to the missing rules under security groups or network ACLs of the source or destination.
Use Reachability Analyzer to check reachability between two resources in VPCs connected using VPC peering. This VPC tool validates that the network configuration (network ACL, security group, and route table) are configured correctly. Be aware that Reachability Analyzer requires that the source and destination resources are owned by the same AWS account and are in the same Region.