PROBLEM: Loss of Internet connection.
Installed a wireless router (Hawking HWR54G) on Comcast Cable Internet service that was being used for a single PC. When the wireless router failed to get a DHCP lease, I cloned the MAC address of the single PC, which seemed to solve the DHCP problem. I did this because I had seen advice on the Internet that Comcast was registering the MAC address in a semi-permanent database.
However, when the DHCP lease ran out the wireless router was unable to renew it, resulting in loss of Internet connectivity (as seen from both wired and wireless client computers). I reconnected the original PC to the cable modem in order to renew the DHCP lease, then reconnected the wireless router, but the problem recurred when the DHCP lease again ran out.
Comcast Support advised me that the MAC address *isn't* registered in a semi-permanent database -- it's only retained as part of the DHCP lease. So instead of cloning the MAC address for the old DHCP lease, I should have instead obtained a new DHCP lease for the router. Here's how to do that:
- Make sure the wireless router is configured correctly for DHCP on a cable modem, with the default (not cloned) MAC address (restored if necessary).
- (Not suggested by Comcast, but it can't hurt.) Disconnect the wireless router from the cable modem and hook the original PC back up to the cable modem. Wait until it is connected to the Internet. Then open a CMD window (Start -> Run -> CMD) and run "IPCONFIG /RELEASE" (to release any existing DHCP leases). When that completes, close the CMD window, and reconnect the wireless router to the cable modem.
- Unplug the power on both the cable modem and the wireless router. Wait 30 seconds or more.
- Plug in power to the cable modem, and wait at least 30 seconds for it to power up and go online (lights resuming their normal flashing pattern).
- Plug in power to the wireless router, and wait at least 30 seconds for it to power up and obtain a DHCP lease.
- Log in to the wireless router with an Internet browser (e.g., Internet Explorer) and verify that a DHCP lease was successfully obtained.
The first DHCP lease obtained by the wireless router after this procedure was for only one hour. At the end of that lease the wireless router successfully renewed it, this time for a period of four days. No further DHCP problems have occurred.