I’ve encountered two occurences locally of an oddity of late with Virgin Media cable Internet services: this may be related to speed upgrades?. In each case, internet routers have stopped connecting. Swapping the PC directly to the cable modem works OK, putting the router back fails. Before anyone junks their router, try changing the MAC address of the router via it’s web interface- most have the facility to clone the MAC of the PC. Then reboot everything, but allow the cable modem to fully start before powering up the router.

It seems that VM are handing out duff DHCP addresses (I saw a combination of 92.x.x.x with a mask of 255.255.255.x and a gateway of 77.x.x.x, and of course, once an address has been issued, it will tend to be re-issued to a device (the router) until the lease expires- which could take several days of power-off. Spoofing a different address forces a new lease, which seems to work. I don’t know what has happened, but something is wrong, and it isn’t your router…