Manual:$wgApplyIpBlocksToXff/en

From Linux Web Expert

<translate> Access</translate>: $wgApplyIpBlocksToXff
Apply IP address blocks also to users having a blocked IP in their XFF header.
<translate> Introduced in version:</translate>1.22.0 (Gerrit change 56715; git #d99bda6e)
<translate> Removed in version:</translate><translate> still in use</translate>
<translate> Allowed values:</translate>(boolean)
<translate> Default value:</translate>false

Details

When it's set to true, IP address blocks apply also to users having a blocked IP in their XFF header (X-Forwarded-For).

Useful when dealing with vandals making use of well-behaving proxies.