It does.
Try it.
Think about it. What would be the point of a DynDNS function that updates the account with your NAS's internal IP address? It works out what your EXTERNAL IP address is, even though it's sitting behind your router/firewall (hint: DNS-323 gateway address).
You really should have a better understanding of these things before stating ill informed information.
yes - technically it is *supposed* to work wherever the ddns resides - however, on the 321 it does not work
it's some type of bug on the firmware
try it yourself - as i have tried
plus, this is the 321 forum, not the 323
thanks
*edit
to clarify, when i set it up - the ddns on the dns-321 worked - for logging in and connecting with dyndns.com - however, once the wan ip changed, the dns-321 did not update like a ddns should - anyone else experienced this? or am i the only isolated event? (irregardless, i disable it on my dns-321 and enable on my router)