http://dd-wrt.com/wiki/index.php/D-Link_DIR-825
http://dd-wrt.com/site/support/other-downloads?path=others%2Feko%2FBrainSlayer-V24-preSP2%2F
Your wireless "dd-wrt" will be on and open once flashed with DD-WRT. This allows anyone including unauthorized users to access and use your open wireless network. Please watch video on how to change.