The recommended Admin tools for Battlefield 3 is “Procon”.
Every client that has any Battlefield server hosted with us can have a free Procon Layer. In case you wish to obtain one, contact Fragnet support.
Apart from giving you an option to configure your server and administrate it, Procon offers an ability to place various plugins on your server.
Procon Client can be obtained from here: Procon Download
For help on how to use Procon client and how to configure your server with Procon, please refer to Procon Layer Knowledge base section.