Thread:Project:Support desk/Using a range of IP addresses within $wgSquidServers/reply (3)

Then you probably want to fill an enhancement bug about that.

Alternatively, you can also set that variable programatically (i.e. not as a "static" value) sniffing yourself the XFF request headers, or even creating a function for checking CIDR ranges to see if the client's IP is part of that netmask and assigning that client IP to $wgSquidServers when it matches, or leave it empty if not.

See for example http://stackoverflow.com/questions/594112/matching-an-ip-to-a-cidr-mask-in-php5