Joao Cardoso has made a replacement firmware. This is in active development as at Dec 2010 and is successful on rev A and B hardware with C close to completion.

The firmware can be flashed over the existing Dlink firmware or used in a 'reloaded' fashion, loading after Dlink firmware.

Project Home Page : http://sites.google.com/site/altfirmware/

Benefits include:

• Up-to-date Linux Kernel
• Extensive Web based administration
• Web based package management and configuration
• Precompiled packages for alt-f and ffp

Note: The blog page for this work is from 2008

Helge has instructions for creating a custom firmware. Helge reports that the firmware created via this process can be uploaded to the DNS-323 web interface! Apparently this eliminates the need for using a serial port to flash the 323…

Testers wanted :). If this works, we could start working on a community firmware to replace the wretched D-Link firmware?

http://blog.leschinsky.in.ua/2008/06/09/building-firmware-binary-image-d-link-dns-323/

http://blog.leschinsky.in.ua/tag/dns-323/

Some of the site is in Ukrainian, but it looks like all of the dns-323 stuff is in good english.