Cross-Region AWS PrivateLink monitoring with Amazon CloudWatch Network Synthetic Monitor

This article explains how to monitor cross-Region AWS PrivateLink connections using Amazon CloudWatch Network Synthetic Monitor to detect network degradation and latency issues.

• Network Synthetic Monitor deploys AWS-managed probes within VPC subnets to test PrivateLink endpoints continuously
• Detects "grey failures" including packet loss and latency on critical network paths across regions
• Probes use TCP protocol since PrivateLink endpoints don't forward ICMP (ping) traffic
• Setup involves creating PrivateLink connection, locating endpoint IP, configuring monitor with TCP protocol and port
• Out-of-the-box CloudWatch dashboards display RTT and packet loss metrics for each probe
• CloudWatch Alarms integrate with SNS, Lambda, and EventBridge for automated remediation workflows
• Complements AWS Health, Network Manager Infrastructure Performance, and VPC Flow Logs for comprehensive monitoring

Network Synthetic Monitor enables rapid detection and troubleshooting of cross-Region PrivateLink path degradations through continuous synthetic testing with minimal operational overhead.