Why Are Backend Servers Frequently Accessed by IP Addresses in 100.125.0.0/16?
Shared load balancers use IP addresses in 100.125.0.0/16 as source addresses to route traffic to backend servers and to check the health of backend servers, if you have configured a health check.
To ensure that your shared load balancer can provide services properly, ensure that the security groups configured for the backend servers allow traffic from 100.125.0.0/16.
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