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Does a security group associated with the EC2 instances permit traffic from the external source CIDR?
If the instance security group rules permit access from the VPC CIDR but not the external source CIDR, requests will succeed when client IP preservation is disabled (because the instances see requests coming from the NLB) and fail when client IP preservation is enabled (because the instances see requests coming from the external source CIDR).
답변함 2년 전
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The security group associated with the instances is allowing port 80 from 0.0.0.0/0. I am even able to bypass the LB and talk to the instances directly from the external source CIDR.
답변함 2년 전
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