Hello,
Today I upgraded firmware on my DIR-300 NRU B5 router from version 1.3.3 to the latest version 1.4.9 and didn't find Local domain option in settings. I can't really remember if it was present in previous firmware, but I most certainly could access my home computers by names like "homepc.dlink" and now I can't. Googling suggests however that such an option was present in other router revisions, not B5.
Slightly off-topic, but I also would like to note that command panel interface becomes less and less usable. It wasn't as bad when I upgraded from 1.2.* to 1.3.3, but now it has become much worse. Maybe it was the problem why I couldn't find necessary option.
Any suggestions will be appreciated.