Thread:Project:Support desk/Using a range of IP addresses within $wgSquidServers/reply (4)

first of all the variable you want to use is probably http://www.mediawiki.org/wiki/Manual:$wgSquidServersNoPurge since I don't think you would want to be sending purge requests to all these servers (?)

second have you considered using extension:TrustedXFF. it can specify ranges from which to trust xff headers