Comcast Modem Chat Session

Router Cable Modem Computer
Comcast eSupport Chat Transcript

James > Can I hook up another extra modem on my current system, by just getting an extra IP address and calling my extra modem number into Comcast central?

Allan > Hello James, Thank you for contacting Comcast Live Chat Support. My name is Allan. Please give me one moment to review your information.

Allan > No, you would need to have a second subscription to the Internet service.

Allan > Which would double your monthly rate.

James > Are you sure of this? Because when I talked to the the install guy last year, I thought he said I could do that.

Allan > Yes, I am sure. If you would like to have a second cable modem, you would need to contact our Sales department, and have them create a "second house key", which will allow a second cable modem to connect. This will result in a second charge for the internet service.

Allan > If you simply want to get a second computer connected to the internet, you could set up a home network.

James > OK thanks for that info. What then does other dynamic IP addresses do for you?

Allan > You can use a hub, switch, or router. Use of a hub or switch will require to you purchase a second IP address from us, which is $4.95 per month.

Allan > A properly configured router will not require an additional IP address.

Allan > The additional IP address allows additional computers to get online, when using a hub or switch.

James > I understand that from a router standpoint that I don’t need additional IP addresses. So, what is the reason to have more than one IP address? Is it possibly for gaming? When two people want to be hooked up but with unique IP addresses from the same location?

Allan > The Comcast service comes with a single IP address. When your computer is connected directly to the cable modem, that IP address is assigned to the computer. When you have a router connected to the cable modem, the router will receive that IP address, and then the router will assign separate IP addresses to the computers connected to the router. A Hub and a Switch do not have the ability to assign IP addresses. So when you have a hub/switch connected to the cable modem, the single IP address that Comcast provides will allow one computer to get online. You would need to get a second IP address for the second computer.

James > Does having an extra IP address, and hooking up the extra computer through the hub or switch keep the speed to each computer faster than one IP address and using a router?

Allan > There is no significant difference between using a hub, switch or router.

James > OK, that answers my questions. Thanks for the help. Much appreciated.

Allan > You’re most welcome.

Allan > Analyst has closed chat and left the room

Thank you Comcast for an excellent and fast response to my questions. I was very impressed with the eSupport Chat Session.

Read the Comcast Home Networking 101 information page.

Read more about installing two or more Comcast Modems at the same location.

Jim Warholic

Business Internet Marketing Solutions


I think it’s certainly very cheap and crappy of comcast to DOUBLE your billing rate just to hook a second modem into your same line. We have a modem and router installed centrally in the house, in a pet room, where it has to be kept up high. I have a desktop PC that is not wireless-capable that is in an office in the corner of the house. If I locate the modem and router in the office, there are parts of the house that get no wireless signal. If I keep the modem and router central, I can’t connect my office PC to the internet at all without drilling all over the house and running 60 feet or more of ethernet cable. Allowing a 2nd modem would easily solve this problem…but, umm, yeah, thanks for being so FRICKIN cheap Comcast!

Jim Warholic

Hello Anonymous,

I don’t hold that against Comcast. In my opinion, there are other options that are just as good, if not better, than having to pay for and installing a second Comcast Broadband Cable Modem.

If you want to expand your wireless coverage, you could install an extra access point in your home or business. With the new wireless access point expanders such as the Linksys Wireless-G Range Expander WRE54G Repeater and others, you do not even have to plug in a hardwire cable for the access point. You can simply place the wireless repeater within the range (toward the extreme range) of your main access point or wireless router, and it “bounces” the signals out to other remote wireless devices on your network. This has the affect of increasing your network range on the hop. You could theoretically blanket a wide area network using this wireless repeater technique, making your whole area a hot spot.

Also, with adding a simple, low cost wireless USB receiver/transmitter network device on any desktop PC, you can now place that PC anywhere in your house or workplace and gain Internet access, as well as hooking up to your own local area network, without having to drill holes in walls in order to run a hardwire Ethernet cable from one access point to another.

So, take a close look at those options before drilling a ton of holes in your walls. Using these types of wireless repeater devices could end up saving you time and money, and make your home, office, or business a hot spot today.

Best regards,


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