I'm trying to set up a router, but the setup keeps telling me that my Ethernet adapter is not working. The Ethernet adapter troubleshooting tells me that the computer is configured correctly but the DNS server is not responding. (During this time the Internet is working as I have the cable plugged in to the computer.) I have the adapter set to automatically find the DNS server. I have run ipconfig/flushdns and ipconfig /registerdns to no avail. Do I need to get another network adapter? My laptop is probably at least 6 years old, and this problem started after I upgraded to 8 from XP - I had the router set up just fine on the old version. Thanks for your help!
If you are "trying to set up a router" can you please advise us as to the Manufacturer's Name, Model Name, Model Number and any other identifying tags on the "router"
The current time that "the internet is working" you have the cable plugged from your Comcast Modem directly into your computer and that IP configuration that you have displayed above is typical of a comcast setup and that is likely why the internet is working.
That would be the cable that you would typically plug into the WAN port of your "router". And then from one of the switch ports on the "router" you would typically plug into your ethernet port on your computer where you currently have the Comcast Modem direct connection plugged in.
If we knew the make and model of the router that is giving you problems we might be able to help further, perhaps a firmware upgrade from the device manufacturer if available.
But for now I am assuming that you have a publicly addressable IP configuration because you are going directly from your Comcast device (likely an ARRIS modem) to your ethernet port on your machine rather that to your WAN port on your router.