F5 BIG-IP Local Traffic Manager Client IP Visibility Solution

This document is a technical report that outlines the capabilities of F5 BIG-IP Local Traffic Manager (LTM) in enhancing client IP visibility for organizations utilizing content delivery networks (CDNs) and legacy infrastructures. It details the critical role of accurate client IP logging in modern applications, emphasizing the challenges faced by organizations when CDNs mask original source IP addresses. The report explains how F5 BIG-IP LTM employs Secure Network Address Translation (SNAT) and custom iRules to maintain client IP visibility without necessitating changes to backend systems. A case study illustrates how a financial services organization successfully implemented BIG-IP LTM to extract and log original client IPs from the X-Forwarded-For (XFF) header. The report concludes with the benefits of optimized routing, seamless integration, reliable traffic flow, accurate data analytics, and enhanced security, all achieved while preserving session integrity and minimizing disruption to existing infrastructure.