What does the insert XForwarded option in an HTTP profile do?

The BIG-IP self-IP is not inserted into the IP source address field on the server-side connection by this feature; X-Forwarded-For operates at the HTTP application layer by modifying a header, not by rewriting a packet address field.

The BIG-IP self-IP is not inserted into any address field on the client-side connection; the feature modifies an HTTP request header in traffic directed toward the server, not toward the client.

The X-Forwarded-For option modifies HTTP headers in traffic forwarded to pool members, not in syslog messages; remote syslog integration uses a separate logging configuration on the BIG-IP.

When BIG-IP proxies or SNATs traffic, pool members only see the BIG-IP address as the source; inserting the X-Forwarded-For HTTP header allows servers to retrieve the true client IP address for logging, access control, and application logic without inspecting lower-layer packet fields.