http://www.mediawiki.org/wiki/Talk:Admin_tools_development#Ability_to_block_referring_IP_on_XFF
In addition to what Billinghurst has requested, it might be nice if in the future, an abuser uses carrier-grade NAT, we can block something like "103.6.23.5/24/xff:10.0.0.0/16" as well.
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=23343