Apache mod_rpaf configuration used in combination with Varnish. When using Varnish the $SERVER variable remote_addr is set to the Varnish server IP instead of the client ip (site visitor). If Varnish is configured to send X-Forwarded-For headers containing the client IP, then mod_rpaf can use that information and set remote_addr to the client IP…

rpaf.ini

<IfModule rpaf_module>
    RPAFenable On

    # When enabled, take the incoming X-Host header and
    # update the virtualhost settings accordingly:
    RPAFsethostname On

    # Define which IP's are your frontend proxies that sends
    # the correct X-Forwarded-For headers:
    RPAFproxy_ips 123.123.123.123 10.0.0.2 127.0.0.1

    # Change the header name to parse from the default
    # X-Forwarded-For to something of your choice:
    RPAFheader HTTP_X_FORWARDED_FOR

</IfModule>