My router doesn't serve DNS on Ethernet ports

The problem ended up being the netgear switch that sat between my office and the ATT router after testing networks and ports on router I rebooted the netgear switch again and everything started to work again.  Strangely enough the router would let DHCP traffic go through sometimes so you would have an IP but you couldn't actually use the computer since all DNS traffic was getting dropped. 

Let's make sure all your devices are connected properly, @asadba! 

If you haven't already, we recommend factory resetting your gateway to rule out any 3rd party equipment or custom settings that may be causing this.

1. Press and hold the gateway Reset button for at least 10 seconds. If you let go before 10 seconds, the gateway will reboot, but it won’t reset.
2. Wait until the gateway restarts and all the status lights are lit. 
3. See if the Broadband or Service status lights are solid green. If so, the reset worked.

This will get rid of any settings you may have changed, so we recommend writing down the settings you'd like to keep.

Please let us know if this helps! If not, we may need to take a closer look at your equipment! 

Raiden, AT&T Community Specailist 

Thanks for sharing that information with us @asadba. We're glad that you were able to get your router connection resolved. 

Please reach back out if you ever have any future questions. Thanks for contacting the AT&T Community Forums. 

Robert, AT&T Community Specialist