Varnish X-Forwarded-For VCL snippet

x-forwarded-for.vcl

# See http://www.varnish-cache.org/trac/ticket/540
sub inject_forwarded_for {

    # Rename the incoming XFF header to work around a Varnish bug.
    if (req.http.X-Forwarded-For) {
        # Append the client IP
        set req.http.X-Real-Forwarded-For = req.http.X-Forwarded-For ", " regsub(client.ip, ":.*", "");
        #unset req.http.X-Forwarded-For;
    }
    else {
        # Simply use the client IP
        set req.http.X-Real-Forwarded-For = regsub(client.ip, ":.*", "");
    }
}

# ... and then later in vcl_recv()
#call inject_forwarded_for;