I cant get out to the internet when I connect the netgear router.

What you're missing is that ALL the PCs will be connecting THROUGH the router to the Modem. Unplug the PC network Cable from the modem, then plug a network cable from the router's INTERNET port into the modem (where you removed the PC's network cable). Now, plug the PC's network cable into one of the ports on the router (usually 4 or more, marked 1,2,3,4. Think of a Router as a "splitter". It connects to the Modem, then several devices connect to the Router, some of them by wire and some by Wi-Fi. So your desktop PC is connected by wire to the router and your laptop PC is probably connected by Wi-Fi (wire is an option, as well). The Router sorts out all those signals and communicates with the Modem. Sound reasonable?

Yes she is right.

leeb..... switches cannot be connected to the Cable modem.... because NAT will not be enabled in cable modem....so there wont be any DHCP server present in the cable modem....
Nat will be enabled only in DSL modem like AT&T verizon etc....So DHCP server will be present inside DSL modem...that is the reason why switches can be connected only to the DSL modem....
With NAT enabled modem, switch will work as a switch.... With NAT disabled modem, switch will work as a hub.... This is the difference....
Any doubts further ? please clarify with me.... I am ready to help you....

• You can use both Ethernet and USB interface to connect two PCs simultaneously with one cable modem.

• If you plan to go wireless (and maybe connect more computers), you have to purchase a router to split/share the internet connection coming from the modem.

Cable modems bond to what they are plugged into, so you have the modem plugged into a computer and it is working fine. Then you want to unplug the ethernet cable from the computer and plug it into another device such as a netgear router. Then you find no matter what you do it will not work.

Now normally to break this bond to the computer so that it will bond with the router you would simply unplug the electrical power from the cable modem, wait for it to sync back up with your ISP's CMTS, power up your router which you would have connected via the internet or wan port, and you would be up and running.

You may have even did this with your Arris TM602. Why isn't your router pulling an IP address? The reason is simple, pulling the power cord did not really remove power since the modem has battery back up.

In order to make it release its bond to your computer, so it can bond with the router you need to either push the reset button on the back of the modem while still powered up or remove its battery pack while unplugged from power.

So try again, this time push reset on the modem. This question was posted in January so I am sure buttercup is all fine by now but maybe this will help someone else.

only they can fix there silly modem and system ! if dead.
"my old" what does that mean>?
that is only a CABLE ONLY model. from Comcast (theirs)
that means NO ROUTER. < never run lacking one. buy one.
SURFboard SB5101 DOCSIS 2.0 Cable Modem
no wifi at all,there just one Ethernet port (sublan)
best is add router (say netgear) to this this old modem
and then let the router do its job and all IOT, all work.
IOT is internet of THINGS. (all)
test wired first then play with wifi, last, set it up. per the routers manual
or ask
buy a router first , own one, not old , new , new are safe.
routers only not cable/router combo's
like Netgear AC750 on up.
R6020 like these (not docsis)
the costs are based on speed.
https://www.walmart.com/search?q=netgear&sort=price_low

you must RTM , to set up any router. Read the manual.
set SSID
use WPA1/2 mode
set in a wifi password, ( a good one, that is safe.)

check out the new Netgear that have preset SSID.

https://www.downloads.netgear.com/files/GDC/R6020/R6020_UM_EN.pdf

I like where Netgear is going with that. pre assigned at the factory,
and ready to run, no setup.. for noobs a big deal that.
but your are not locked out of settings at all, PAGE 57

Plug the ethernet net cord into the arris ethernet port. plug the other end into the router where it says "internet"

Plug a ethernet cable from one of the router ports to the computer.

First start up the arris modem, then power up the router, then start the computer.

Turn everything off:
Cable modem unplug the power to the modem if it has a battery remove it.
Router unplug the power to the router
Shutdown any and all computers connected to the router

Turn everything on in this order:
Cable modem wait until all the lights are on but the internet act light
Router wait until the lights goes through it's test cycle and the internet light (wan) is on.
Boot up the computers one at a time after the first computer is fully loaded go to the next computer

Hope this helps

Terry

Can you connect if you are directly wired into the router?

You may want to try using a ball point pen and pressing the reset button on the back of the arris. Let it reboot and try again.

Some netgear routers come with the wireless disabled out of the box, so you need to be hard wired when you run the CD or if you try to connect through your browser 192.168.1.1

Only real trouble shooting I can suggest is power cycle the modem and router. If you have the Comcast Digital Voice modem make sure you push the reset button on the back as there is a battery in the unit and unplugging won't do anything.