Share USB cable modem with ethernet router

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csnplt

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Oct 9, 2008
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I want to share the internet connection from my Arris TM502G cable modem, connected via USB, to my desktop's pci ethernet adaptor. To the pci ethernet port, I want to connect my WiFi router.

When I bridge the two connections, I can't get on the internet anymore from the desktop connected via usb, and if I share the internet connection on the USB cable modem to the ethernet port on the computer, I cannot ping the router. However, I can ping the router from my Wireless laptop. I have the ethernet cable plugged into the first port on the router (the one that usually goes to the cable modem), but I have also tried the first computer port on the router.The router configuration page does not show an internet connection, and it can't see my desktop computer, only my laptop.

The desktop has a self-assigned ip.

The reason that I want to do this is that my router has not been working while connected the usual, cable modem --> ethernet cable --> router --> computer way. It works for several minutes to several hours, but drops the internet connection (I can still browse the network, though). BTW, the router is a belkin F5d7230-4 with B and G wifi.

I am running Windows XP with SP2
Please help.
 

TerryNet

Terry
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What do you want to try to do? If the router is dropping the WAN connection it will probably drop it no matter what it is connected to. See if there is a firmware upgrade and then reset the router to factory default settings. Sometimes one or both these steps will "shock" it into behaving again.

You can't bridge the connections as you described unless you are paying for two public IP addresses from your ISP. And then you still may not be able to because you can probably only get one on the USB connection.

If you want to use the Belkin as an ethernet switch and wireless access point the following is the complete procedure.

JohnWill's procedure (Aug. 30, 2008) for configuring a secondary router as a switch and, optionally, wireless access point follows.

Connecting two (or more) SOHO broadband routers together.

Note: The "primary" router can be an actual router, a software gateway like Microsoft Internet Connection Sharing, or a server connection that has the capability to supply more than one IP address using DHCP server capability. No changes are made to the primary "router" configuration.

Configure the IP address of the secondary router(s) to be in the same subnet as the primary router, but out of the range of the DHCP server in the primary router. For instance DHCP server addresses 192.168.0.2 through 192.168.0.100, I'd assign the secondary router 192.168.0.254 as it's IP address, 192.168.0.253 for another router, etc.

Note: Do this first, as you will have to reboot the computer to connect to the router again for the remaining changes.

Disable the DHCP server in the secondary router.

Setup the wireless section just the way you would if it was the primary router, channels, encryption, etc.

Connect from the primary router's LAN port to one of the LAN ports on the secondary router. If there is no uplink port and neither of the routers have auto-sensing ports, use a cross-over cable. [You will not need a cross-over cable if one of the "routers" is a computer.] Leave the WAN port unconnected!

This procedure bypasses the routing function (NAT layer) and configures the router as a switch (or wireless access point for wireless routers).

For reference, here's a link to a Typical example config using a Netgear router
 

JohnWill

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Actually, I think this configuration may require ICS, since he needs two IP addresses, and I suspect that modem will only give him one. That's why bridging doesn't work.
 
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