Does a second modem require a second IP address?

[JakeWho]

I'm sorry for the dumb question, but I have a dual cable modem that runs internet and phone service but it is set up in a poor area of the house. And is unable to be moved due to the position of the phones and phone cables/connectors. Unfortunately running ethernet through the house is too much of a cosmectic issue for the home owner and I don't have the means to run ethernet under the house. Running a power line adapter to the side of the house won't work either due to old wiring in the walls. I guess my question is, if I were to buy an extra modem and run a cable from an active cable wall jack on the other side of the house, would it need it's own IP address and if so, are you able to have two IP addresses on the same cable internet connection?

 

[USAFRet]

I'm sorry for the dumb question, but I have a dual cable modem that runs internet and phone service but it is set up in a poor area of the house. And is unable to be moved due to the position of the phones and phone cables/connectors. Unfortunately running ethernet through the house is too much of a cosmectic issue for the home owner and I don't have the means to run ethernet under the house. Running a power line adapter to the side of the house won't work either due to old wiring in the walls. I guess my question is, if I were to buy an extra modem and run a cable from an active cable wall jack on the other side of the house, would it need it's own IP address and if so, are you able to have two IP addresses on the same cable internet connection?

Terminology:
Modem, router, access point

What you are looking for is an Access Point, or a WiFi router dumbed down to be an access point.
Not a 'modem'.

 

[RealBeast]

You can run an Ethernet cable from an LAN port on the main router to an LAN port on the second router and set the second router up as an access point. Turn off DHCP on the second router and give the second router a static IP address that is in the network range but not in the main router DHCP assignment range (so that the main router does not assign that address to another device and create a conflict). Set up the wireless so that it uses different channels from the main router. SSID and password are up to you, you may want a different SSID from the main wireless router so that you can force devices to connect to the radio of your choice.

Then all devices connected by wireless or the other 3 LAN ports on the AP router will be assigned addresses by the main router DHCP.

 

[JakeWho]

The problem is unfortunately, that I am unable to, for multiple reasons, run an ethernet cable across the house to a second router to create another access point, or even move the one I h ave and run a cable to the desired location. I was just curious if a second modem could be used from another existing cable jack to run into a second router that way. I guess the setup in question would be: Two different cable wall jacks on opposite ends of the house, connected to two different modems, which are each running into their own router. I can also complete the setup with only one router, if that would make the scenario more likely.

 

[BuddhaSkoota]

The problem is unfortunately, that I am unable to, for multiple reasons, run an ethernet cable across the house to a second router to create another access point, or even move the one I h ave and run a cable to the desired location. I was just curious if a second modem could be used from another existing cable jack to run into a second router that way. I guess the setup in question would be: Two different cable wall jacks on opposite ends of the house, connected to two different modems, which are each running into their own router. I can also complete the setup with only one router, if that would make the scenario more likely.

- Using a second modem will require a separate subscriber account. Should be possible, but you'll need to check with your ISP to find if it's permitted.

- You can use MoCA capable devices (adapters) to establish a connection over the coax cables. This will allow you to connect the first router to an AP (or second router configured as an AP) on the other side of the house. http://www.actiontec.com/products/14.php