new comcast modem

[Aganack1]

so somehow my old modem died on me and so comcast came out and installed a new one and it works great on one computer but when i try to run it through my negear router it wont work. Any ideas why? Or what i can do to get it to work again.

 

[Jeff7181]

K.I.S.S.... did you disconnect the router from power, turn the modem on, let it do it's thing and get connected to the server, THEN power on the router?

 

[FlyingPenguin]

Ditto what Jeff said. To elaborate: Cable modems "lock" to the first MAC address they see. If you connect the modem to another device then it won't communicate with it until you power-cycle (off - on) the modem. That forces it to "lock" to the new device's MAC address.

Don't just use the power switch on it - unlug the power cord, connect it to the new device, plug the power back in.