two separate units. I have had D-link modems and routers. I've upgraded my modem to the Cisco DCP3000 which is DOCSIS 3 and IPv6 ready, and is Gigabit output. I use the D-link DIR-655 router which is wireless B/G/N and Gigabit wired. If these two units won't do it you don't need it. And I'm ready for any ISP upgrades.
I've had a 2Wire gateway that I got from AT&T for about 5 years.
Although I've seen terrible reviews for 2Wire, I've had pretty good luck
with this one. Now the Power light is a steady red and only light on.
Tech support says that it's most likely the power adapter.
As I understand, most what are called modems or routers today are a
combination of these two, is that right? I see them in stores ranging
from $30 to $200 or more, and they all say they do the same thing -
almost identical wording. If it turns out that my adapter is good, what
should I be looking for?