please make sure you know what your doing with regards to DD WRT or don't bother and use D Links original firmware.. not sure whether D Link have an update available check on their support site.
Peter, in your router replacement thread has posted instructions on how to set up the D Link using its factory firmware.
Regarding DD WRT firmware, the latest stable release for the D4 is >
ftp://dd-wrt.com/others/eko/BrainSla...dlink-dir615d/