Look at the sticker on the bottom of your router. It should say "H/W Rev:" followed by a letter (e.g., A1, Ax, B1).

A firmware flash can sometimes wipe old configuration details clean.

Below is a comprehensive technical write-up regarding the firmware architecture, analysis, and modification of the DWR series routers, specifically tailored for the M960 architecture.

: Even with the latest firmware, rebooting once a week helps clear memory cache.

Multiple stack-based overflows have been discovered in the Port Forwarding, Advanced Firewall, and VPN configuration endpoints of version 1.01.07. (Non-US) DWR-M960 : H/W Rev. Ax :: F/W v1.1.49 - D-Link

: Visit the official D-Link Support Page to download the latest, most secure version of the firmware file.