... You are absolutely right, the version of firmware installed in fact is the 1.02b03, and I have a feeling that it's the retreat from Dlink for reasons not stated, probably because of no rigorous test of the whole operation, and also the rush to to release a firmware that supports 3TB drives, advanced formatting etc.etc.
For the moment, fortunately I do not have big problems to keep it without the add-on, because used only as a backup, there are big problems in the firmware for this function, which is why I did not give complete technical details, are in fact waiting for a 'but this time the other DNS 345, DNS-343 evolution, but I'm seriously thinking that maybe a little too much, having as many as 3 DNS-323 and DNS-343, except that here in Italy fortunately I find them cheap in chains provided a lot.
(Indeed, if interested I can provide links maybe to see if it really cheap!)
Thanks again for your kind response and good work.