Forum Discussion
Kevin_Stewart
Feb 05, 2014Employee
XFF is an HTTP header value (layer 7), where your web servers are probably filtering on the actual layer source addresses. You can certainly configure an IIS box to evaluate an XFF value though:
https://devcentral.f5.com/articles/iis-x-forward-for-isapi-filter.UvJRDrRs2qs
Alternatively, if you don't need to apply SNAT (secure network address translation) at the VIP, then the client source should make its way to the web server directly.