Proxy Servers and Caching Engines
The X-Forwarded-For field is supported by most proxy servers, including Squid, Apache mod_proxy, Pound, HAProxy, Varnish cache, IronPort Web Security Appliance, CAI Networks WebMux, ArrayNetworks, Radware's AppDirector and Alteon ADC, ADC-VX, and ADC-VA, F5 Big-IP, Blue Coat ProxySG, Cisco Cache Engine, McAfee Web Gateway, Phion Airlock, Finjan's Vital Security, NetApp NetCache, jetNEXUS, Crescendo Networks' Maestro, and Web Adjuster.
X-Forwarded-For logging is supported by many web servers including Apache. Microsoft IIS 6.0 & 7.0 can use a third party ISAPI filter to accomplish this task. IIS 7.0 can also use a HTTP Module for this filtering.
Read more about this topic: X-Forwarded-For
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