I have a Cisco E3000, with a DNS-321 hooked up to it via ethernet. 
Using the E3000 interface, I can find the IP for the DNS-321. I can then type that IP address in the address bar of a browser and get to the DNS-321 interface just fine. But, I can't see it in the Finder. 
The E3000 has 2 Wifi networks, and I tried on both - same result: can IP to it, can't see in Finder. I have a printer that connects only on the G Wifi network, and I can see it on either Wifi from the Mac. I tried with my PC via ethernet, and it shows up also on either Wifi networks. 
Any ideas?