If this is impacting your targets you can consider using a less expensive HTTP target, such as a static HTML file, or the least resource intensive option, a TCP health check. Having fewer targets in a Target Group will increase the number of these health checks which they each receive. There is 1 of these health checks for each Target Group. However, Network Load Balancer routes these requests to healthy targets. This is similar to how both Classic and Application Load Balancers are health checked externally by Route 53. In addition to the target health checks, Network Load Balancers are health checked externally by Route 53. The Network Load Balancer distributed health checks will connect to each target 3 times per configured Health Check interval. MLL controls load for a variety of reasons, including minimising our contribution to the loading on the regional transmission grid during peak times, and in response to faults or emergencies. Here is the aws support reply: This expected behavior is due to the distributed nature of Network Load Balancer health checks and the consensus mechanisms used to determine target health. In Method Response, HTTP Status is Proxy, HTTP Status is 200. There is a known ‘issue’ with Network ELB health check! I opened a case to AWS Support. Browse through Network Load Balancer questions or showcase your expertise by answering. Please check how to retrieve Network Load Balancer source IP address for health check. At least you must allow Network ELB IP address. If you limit access to the instance with a strict security group, you must allow same VPC CIDR to make health check works. If you specify targets using an instance ID, the source IP addresses of the clients are preserved and provided to your applications(e.g. Only NLBs supports source IP preserving for Non-HTTP applications on EC2 instances. You have to enable Proxy Protocol and implement Proxy-protocol in your backend service. But If your instances running other services like SMTP, you can’t get the client IP.
Use Network Insight to: Monitor the health and performance of all components of application delivery including WideIPs, virtual servers, pool members, and more. If you are using HTTP services on your instances you can get the client IP with X-Forwarded-For header. Network Insight provides comprehensive monitoring for the F5 ® BIG-IP ® family of load balancers, giving you the insight you need to keep your most important services running smoothly. CLBs and ALBs connect to the instances with private Load Balancer IP.
AWS has 3 load balancing products - “Classic Load Balancers” (CLBs), “Application Load Balancers” (ALBs), and “Network Load Balancers” (NLB).ĬLBs and ALBs do not support source IP preserving.
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