To enable the transparent proxy, add the following line to your config.php: ::

    $use_transparent_proxy = true;

In the ACL form, an new field will appear: "Transparent proxy: [none]".

New iptables rules will be generated, eg. ::

    iptables -A PREROUTING -p tcp -m mark ! --mark 0 -j REDIRECT --to-ports 3128

You can change the proxy port in your config.php: ::

    $transparent_proxy_port = 8080;