Your company has a web server hosted on an EC2 Instance. This is being used along with the AWS Application Load Balancer, Cloudfront and S3. There is a requirement to get the IP addresses accessing the web site. How can this be managed if no access has been provided to the AWS console or the API.

Answer options:

A.Use the local metadata on the server to access the logs
B.The access logs should already have this information
C.Add “X-Forwarded For” to the access logs and view the access logs
D.Convert the Application Load balancer to a classic load balancer

Answer – C
The AWS documentation mentions the following on X-Forwarded headers
The X-Forwarded-For request header helps you identify the IP address of a client when you use an HTTP or HTTPS load balancer. Because load balancers intercept traffic between clients and servers, your server access logs contain only the IP address of the load balancer. To see the IP address of the client, use the X-Forwarded-For request header. Elastic Load Balancing stores the IP address of the client in the X-Forwarded-For request header and passes the header to your server.
For more information on X-Forwarded headers please refer to the below URL:
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/x-forwarded-headers.html