For Applications, you can find the settings used under Settings > Web and mobile monitoring > IP determination. Dynatrace uses a few widely used headers to extract the true cient IP address. However, your application may use a custom header for tracing the original client IP. You can add that header in this settings page. Alternatively, there may be a config issue where the load balancer actually strips any header that carries the original client IP and as such this behaviour needs to be corrected at the LB level.