This article explains how to configure client IP address preservation with Network Load Balancers in AWS Global Accelerator, enabling applications to receive original client source IP addresses.

• Global Accelerator now supports client IP preservation with Network Load Balancer endpoints
• Enables security controls, custom business logic, and GeoIP-based filtering based on client IP
• Network Load Balancer must have security groups associated and configured for client traffic
• Security group must allow inbound traffic from clients and health check probes
• VPC containing internal NLB must have internet gateway attached
• Step-by-step configuration includes creating NLB, then accelerator with NLB endpoint
• Testing confirms backend instances receive packets with original client IP as source
• Enables customized user experiences and compliance with data residency requirements

Client IP preservation allows applications to implement location-based customization, security policies, and analytics while maintaining compliance with data regulations.