Using CloudWatch Alarms and Lambda to catch exceptional traffic

This article discusses an innovative approach to monitoring network traffic in AWS Transit Gateway using CloudWatch Alarms, Lambda, and Anomaly Detection.

• Automatically detect unusual network traffic patterns without continuous Flow Logs
• Use CloudWatch Anomaly Detection to establish traffic baselines
• Create CloudWatch alarms that trigger Lambda functions when traffic exceeds normal thresholds
• Enable Flow Logs only during traffic anomalies to reduce costs
• Supports automation for multiple Transit Gateways using AWS Network Manager

The solution provides a cost-effective and intelligent way to monitor network traffic, with flexible implementation options and complete code examples available on GitHub.