Ok, here's my problem. I had comcast, comcast got turned off, we turned it back on, and they came over and gave us a new modem. Now our router wont work with the new modem. Everything works, other than the router: which leads to two other computers and two laptops. We're using a Wireless-G 2.4 GHz Linksys for router, and comcast's D3.0 Ubee. Plz give me a fast answer to solve my simple problem. Thank You.

Unplug your Comcast modem from your electrical outlet. Connect the Ethernet cord from the back of your Comcast modem into the Ethernet port labeled "Internet" on your new router. Connect an available Ethernet port from the back of the new router to the Ethernet port on the back of your computer.


Plug your cable modem into an electrical outlet. Plug your new router in an electrical outlet.


Reboot your computer. Click on "Start," then "Control panel." Click "Network and sharing." Select "Set up a new home network."

Click on the option for a router or cable modem when prompted by Windows to select your hardware. Your computer will attempt to access your new router. When the brand name for your router is listed, double-click it so your computer can configure itself to the new router.


Create a new name for your home network and create a unique password to prevent unauthorized users on your network. Your computer may reset your Comcast modem and router so your new changes can take effect.

I was banging my head for 2 days with about 35 different configurations and finally tried the following and it worked just fine. Also, tried connecting 3 computers and they all connected with "NO" issues. Even connected wireless with "NO" issues. Now I am at 20mb download speed...J compared to AT&T 1.5mb download speed.

This is my DLINK model -> (DIR-601 Wireless N 150 Home Router Wireless router)

1. Reset your Comcast Surfboard Cable Modem by unplugging it for 5 minutes.

2. Then reset your DLINK Router to the manufactures default settings. Then Unplug DLINK Router for 1 minute then plug it back in (Just plug your cat5 cable into port 1 and connect it to your computer) there should not be anything else plugged into the DLINK Router at the time you make the changes. Just 1 computer can be connected.

3. Went into the DLINK configuration 192.168.0.1 and changed the PPPOE setting that I was using for my AT&T Modem to Dynamic IP (DHCP). Once you make the changes save them and then unplug your DLINK Router it's off.

4. Turn on Comcast Surfboard Cable Modem and wait until all lights are on. Now plug in a cat5 cable from the Surfboard Comcast modem (NOT A CROSSOVER CABLE LIKE THE CD INDICATES) to the INTERNET port of your DLINK Router. Now turn on your DLINK router.

5. Then turn on your computers or restart them and it will pick up IP Addresses from your DLINK Router

Hello Ladoof,
We offer support for Comcast supported routers because they are widely used in the world today. If you are using one such router and it has stopped working, then you just need to call us for instant support.
Comcast Tech Support Internet Help Toll Free 1855 856 2653

Your laptop seems to be hooked to your neighbours unsecured network automatically and it is going online with that. About comcast, when you connect a router to the modem or a computer to the modem, the modem has to be rebooted to give a valid IP to the connected device. If the modem is not rebooted the computer or the router will get 192.168.x.x IP address which is called private IP address.

Comcast has a little known "trick" that they use when setting up users. Here's how it works:

When Comcast first comes to setup your new cable modem service, they insist on connecting it to your computer and "testing" it. Most people think nothing of it, and that it's good customer service ...truth be told, what they are doing is attaching your computer's MAC address to that cable modem, so that you cannot create a wireless network. This is because they want you to pay them $150 to do this for you.

In this situation, since the modem is a modem/wireless router in one, my guess is that the MAC address on your machine now does not match the MAC address on the new router, which is what Comcast has stored in their database(s).

Try this: on your computer (while connected to the modem), perform a release on your IP address (start, run, cmd, then type "ipconfig /release"). Disconnect the ethernet cable from the computer. Turn computer off completely. Hold down the reset button on the cable modem until it performs a reset. Once it's back up and running, boot up your computer with the cable back in the ethernet port.

The cable modem should assign a new address to your computer. However, that may or may not work ...this is an easy workaround with a Linksys router, but not necessarily with the all-in-one devices.

Worst case scenario: contact Comcast and notify them that the new modem is not recognizing your computer's MAC address and that it needs to be updated in their system. They will scan your computer (through the telnet interface on your modem) and get your computer's MAC address, then (hopefully) make the necessary changes on their end.

After that, everything should work flawlessly. If not, insist on a Comcast tech to "fix" the service that you are paying for.

Good luck - hope this helps :)

follow the steps in this website:

http://linksys.custhelp.com/cgi-bin/linksys.cfg/php/enduser/std_adp.php?p_faqid=3686&lid=7775537401B414

Well, this is a very generalized problem that others have, so i'll give you some starting tips. If you can connect when you plug your computer directly into the modem, then it sounds like your modem is bonding to your computer. There are a couple ways to fix this. The easiest is to ask your router to clone your MAC addess (not to be confused with a mac computer, a MAC address is a 10 digit code that uniquely identifies your computer on a network). See the attached image to find where it should be.
Once you set it to clone your machines mac address, unplug the computer from the modem, and plug in the router. If this doesn't fix it, please comment back and we'll try some other things. If it does, then give a good rating :-)

Steven

Ok, cable (coax) comes in from wall and attaches to modem. Ethernet cable goes from modem to WAN Port of router. You may have to reboot both devices to ensure that your modem (internet service provider) assigns IP address to your router. If PC is close enough, attach new ethernet cable from one of the 4 ports on your router down to your PC's ethernet adapter. (where your modem used to plug into). Router will now assign an IP address to your PC and you should be able to access the www.

Good Luck and let me know if you have any more questions.

Hi jad123,

I am sorry to learn about the problems you are experiencing with your service.

I will be happy to reach out to my contacts to assist you in resolving this issue. Please feel free to contact me so that I can get more information from you.

Thanks in advance!

Mark C.
Comcast Executive Offices
[email protected]

Hi,

I would suggest you to look into the user manual first it may solve your problem.
Click HERE

Goodluck..