UPDATE: 9/2/2023
Since the DNS323 became a non-supported legacy product on 5/5/2013, as of now (9/2/2023) the software listed below is not available. The links and instructions to go to tsd.dlink.com.tw work, but when actually trying to download the software the pages are not found.
I have found two sites that contain legacy support information and software. The sites have slightly different information.
https://legacy.us.dlink.com/pages/product.aspx?id=dab7c4098c6a49789a2c7386fdfffd0b http://support.dlink.com.au/download/download.aspx?product=DNS-323
The latest firmware revision for the Rev-B is 1.10.b07 released on 04/06/2011.
That is my version, you can find the other versions on those sites.
— below is the original article with pointers —
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D-Link releases the GPL source code for the DNS-323 on their Technical Support web site. Unfortunately it's a stupid JavaScript site, so I can't give a direct link to the DNS-323 page. Instead you'll have to follow these steps:
I haven't tried to build any of this and I don't even know if it's worth bothering with. I didn't see any obvious links in the Wiki or Forum (except buried in a few threads about specific versions) so I figured an obvious page was in order.
upd1: The revision (A1 or B1) is located on the label on the bottom of the device next to H/W.
upd2: direct URL for source code
= revision A1, f/w version 1.04 - http://tsd.dlink.com.tw/temp/download/2968/dns323_GPL_01102008.tgz = revision A1, f/w version 1.03 - http://tsd.dlink.com.tw/temp/download/2945/dns323_GPL_04102007.tgz = revision B1, f/w version 1.05 - http://tsd.dlink.com.tw/temp/download/3034/dns323_GPL_v1.05_05052008.tgz = revision B1, f/w version 1.04 - http://tsd.dlink.com.tw/temp/download/2968/dns323_GPL_01102008.tgz = revision B1, f/w version 1.03 - http://tsd.dlink.com.tw/temp/download/2945/dns323_GPL_04102007.tgz
Updates to firmware are notified on the D-Link Forum
http://forums.dlink.com/index.php?board=155.0
Latest firmware is 1.09 (June 16, 2010)