home network decides not to work anymore

[Belzac]

I have comcast cable and up to now my router was working great.  All of suden I can't connect to the internet with the router.  If I plug computer in to the modem works fine.  Yes i'm clonning the computers mac on the router.  Everything looks correct on the router. (IP, subnet, default gateway.)

Damn it Jim! I'm a programmer not a network guru.

[geldonyetich]

Check to see if both computers can ping the router's address.

If one computer can't reach it, there's your issue.  TCP/IP settings or files are screwed on that rig.

I know that Comcast has been trying to push selling multiple IP addresses, but to my knowledge they have no way of identifying if a router is servicing more than one computer so long as it's only pulling one IP address for the router.

[Lanei]

Does the router use DHCP to get an IP from the cable connection?
If so, did it get one?

Try reseting the router and/or cable modem?

[Ookii]

Having Comcast cable myself, the definitive guide to fixing it if it goes out:

Usually I just check the lights first, you can tell from the lights on the router and cable modem which one is fucking things up about 90% of the time.  I would then unplug the router and cable modem for 5 minutes from power, then plug them back in.  Give it a minute or so, try ipconfig /release, then ipconfig /renew (a little redundant, I just like to make sure), and you should have a brand spankin new IP.  You can also check the router to see what IP the router has from the cable modem, and try renewing and releasing from there.

If this doesn't work call up tech support and get them to do a push on your line, from this point on you really can't do anything.  Also, in Montgomery County (here in Bethesda), they have to legally credit you for every day your cable is out, so be sure to get on that (they also have to answer your tech support call in 30 seconds).

EDIT: Fuck i'm tired, my whole post barely has anything to do with your problem.  If you're router isn't working, there is only so much you can do.  Unplug it from power/reset everything on it, and see if the DHCP works as well as that it is receiving an IP address from the cable modem.  If nothing ends up working, you have yourself a dead router (these things aren't really the lions of the networking kingdom, they are more crazy like a ferret).

[Miguel]

I had a Linksys cable modem router that just up and died...one day working, the next it was dead.  Couldn't even hit the built in web pages to try and reconfigure it.  Oh well, a trip to Fry's, and $75 later, I had a nice shiny new DLink 8 port replacement and it has worked ever since.

Moral of the story:  sometimes, they just give up the ghost.