Hi i have a mac book and i just been trying for a couples of days to get online, i have internet thru comcast and they give me RCA DCM425 Cable modem but after a while connected i loose my conection. and i have to restart the modem.
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first you need to make sure that the new modem is provisioned (added to your account from comcast). you can do this by connecting your router to the coax cable and plugging it in (like the old modem was) then call comcast and ask them to provision the new modem (they will want you to return the old modem a local office to avoid rental fees on it). once the modem is provisioned. 1. unplug the power to the modem and router2. connect the router and modem the way you had it with your old modem (Ethernet/cat5 connects from port on modem to interent/WAN port on router)3. pug both router and modem back in all should work now as long as there are no funky (meaning non-default) settings on your router. so, long answer to say, "no, there should be no special settings that are different for your mac"
My RCA DCM425C from Comcast had the same problem when I came home Saturday, 11/14/09 (coincidentally the same day you posted). Had been working fine - cable TV still works fine including On Demand, etc. The Internet light was blinking. Occasionally I'd see it try to work from one light to three or four, but it always came back to one. Called Comcast, they said their side showed "no signal". Sent out a tech today. He replaced the cable modem, reprovisioned it (I guess if I had a backup ready I could have done the provisioning over the phone maybe?)), everything's great. Lasted about a year and a half. When I logged in via http://192.168.100.1, it said it was still in Step 1 of 5 ("Tuning"), and the logs showed a whole bunch of errors on Saturday that stopped after that. Diagnostics would always freeze the built-in web server and require reboot.
First try connection the Yellow ethernet cable from the rca modem to your computer's network connection. If you get a connection this way, then your modem will work with a ethernet cable. If not, then call Comcast for help. The modem ethernet out to computer port must be connected to the wan line of the router. Then you can connect an ethernet cable from your computer network connection to one of the 4 ports of the router. For wireless connections you must set up the router and wireless adaptor with the same settings to connect. Follow the routers directions.
If that's hooked to comcast you can only have one computer hooked up to it, and no modems as they block mac address. If you are a Comcast customer there is a workaround. Turn on your wife's wireless if she hasit, if not get her a wireless card USB is easiest. Turn on sharing on that wireless card and you will be able to access the internet through your wifes computer, and not run afoul of your Comcast agreement. Or request an upgrade to a wireless router from Comcast but your rent goes from $3.00 per month to $10.00!
Your modem has already registered itself with the MAC address of your computer, so it doesn't recognize the MAC of your router. In cases like this you have two options:
Configure your router to clone the MAC of your computer
Connect the router to your modem and do a soft reset so the modem registers itself with the MAC of your router.
Clone MAC - Go to your routers Admin web interface and on the main page you should see the "Router MAC Address" section at the bottom. Select "Use Computer MAC Address" and click "Apply" and your router should reboot and you'll be back in business.
Soft Reset -
Plug the modem into the router via the ethernet cable then do a soft
To do a soft reset, do the following:
pull the power cord from the modem
count to 5
hold down the Reset EMR button on the modem
plug back in the power
count to 30 while holding the Reset EMR button (the modem should be blinking a lot)
release the Reset EMR button and see what happens.