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You will need to make sure that the Comcast modem is providing internet, you can do this by connecting your laptop to it using ethernet directly if it connects to the internet, that will be a good thing.
From your comcast Modem, the ethernet Cable should go to the linksys where it says "WAN". this should give you an internet connection and make your comcast modem communicate with your linksys Router.
You sure can. Start w/ the Comcast modem as long as it is NOT a USB type and hooks using a CAT-5 cable (regular network cable). Hook the comcast modem to the WAN port of the wireless router. On the back of the wireless router use the normal 1-4 extra LAN ports to hook other computers or the SD208 switch to it and other computers from there.
Word of advise if using Wireless Router, be sure to read manual and set a KEY for your network to secure it from unwanted outside use.
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.
Good Luck
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!
You need to connect a router to the cable modem. The router then gets an IP address from Comcast and provides a gateway between the computers connected to the router.
The modem expects to communicate with a single Ethernet device, and provides an IP address to the first device that provides a piece of data called a MAC address. By placing a router in-between, the router gets the IP address that lets you communicate on the Internet. It provides local IP addresses to the equipment connected to the local Ethernet and "routes" those to the Internet. You can either hook your two devices into the router if it has enough ports, or hook you switch to the router and hook your PC and PS3 into the switch.
From your description, you appear to be connected to the router fine.
Try powering down the modem from Comcast for about 2 minutes then power it back up. If it doesn't come back, call Comcast service as it is likely on their end.
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.
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