N600 cable modem router

[steinste]

I Just left Comcast and now have an ethernet jack that provides internet.
Is there a way to set the n600 to use Ethernet as the internet source instead of the cable rf signal?

[TheEther]

What's the model number?  N600 is a speed class.

Did your new Internet service provide you with a new router?

[steinste]

C3700, it's a byo router situation.
I had a WGT624v2 but i updated the latest firmware which bricked it.

[TheEther]

Unfortunately, the C3700 doesn't have an Ethernet WAN port, so you won't be able to use it as a router.  You'll need to get a new router.  You can use the C3700 as an Access Point to expand your Wi-Fi coverage.  But you may simply be better off selling it.