> Model: D7000|Nighthawk AC1900 VDSL/ADSL Modem Router
Firmware version? ("red port" suggests that it's a D7000[v1], not a
D7000v2, but, if you find something else after "Model" on the product
label, feel free to reveal it.)
> [...] Will it be possible to use my existing D7000 as just a router if
> i connect a ethernet cable from the new modem into the red port labeled
> "Internet" on the D7000? [...]
I'd expect so, but I've looked at the relevant User Manual. You
could, too. Visit http://netgear.com/support , put in your model
number, and look for Documentation. Get the User Manual. Read. Look
for "Set Up the Modem Router for Cable or Fiber Service".
> What settings will i have to change?
Should I know what your current settings are? (Or your current ISP?
Or your current anything else?)
If your DSL service uses a PPPoA or PPPoE connection, then I'd expect
those settings not to apply with your new (also unspecified) cable ISP.
The smart move might be to do a settings reset on the D7000, and let
it try to configure itself automatically, starting with a clean slate.
Look for "Reset" in the User Manual.
> Is there a distance limit that the cable shouldn't go over?
The usual limit for twisted-pair Ethernet is 100m.
