Manual:$wgUsePrivateIPs/en

Details
Determines whether MediaWiki will trust an X-Forwarded-For (XFF) header specifying a private IP in requests from a trusted forwarding proxy.

A trusted forwarding proxy is any proxy listed in either  or.

So if you have two traffic managers (Might be Zeus or F5) sending requests to your webservers, forwarding from an internal network, the config might be this: