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I just switched from Verizon FiOS to Comcast internet. I still have my Verizon Gateway (modem + router combo) - looks like this:

Verizon Gateway (modem + router combo)

I know it's not compatible with Comcast as a gateway device, but if I get a Comcast-compatible modem, can I use the Verizon Gateway as a router and hook the Comcast-compatible modem into it?

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What are you trying to accomplish exactly? There's probably a way to do what you're trying to do. –  David Schwartz Feb 7 '14 at 23:06
I need to get a modem and router (for wifi) - so basically I wanted to see if I could just get a modem, and save money on a router by using the Verizon device. –  jbyrd Feb 8 '14 at 0:40
Try and hook any modem to it and see if it will work. Comcast compatible is irrelevant. And it's possible it will work. You can get lucky. I've done something like that - either that or as a test, plugging the modem into a LAN port rather than the WAN port that was there. In your case you don't have a WAN port but you could still try it in a LAN port see if it works It "shouldn't" but don't rule it out. I think sometimes it might work. though one probably shouldn't use a setup that is dodgy, defying nature! –  barlop Feb 8 '14 at 18:51
i've heard of modem/routers have a function to disable the router aspect but not the modem aspect. If you can get your hands on the manual it might give you a clue. Also, why not just ask comcast to provide a modem/router with their services? –  Sickest Feb 18 '14 at 3:30

1 Answer 1

up vote 3 down vote accepted

The answer is no. In order to use it as a router the device has to have an "incoming" ethernet port. This is where you would plug the Ethernet cable from the Comcast modem and that interface would be assigned the public IP.

Since there is no photo of the back I am going to use my own device that looks similar and it has no ethernet port - it is because the modem and router are connected internally thus there is no need for it.

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Thanks for the info. I'll pick one up at Walmart. –  jbyrd Feb 8 '14 at 3:13
I may have had something like that work once, you can always try it. It might've been with a Router but not using the modem ethernet port (that should be similar to taking a modem/router device, without WAN port, and plugging the modem into a LAN port). But of course, one shouldn't buy a device expecting it to work. –  barlop Feb 8 '14 at 18:50

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