You bought a new computer to replace your old one. You brought it home and followed the quickstart guide, and it's all setup. You then disconnected your ISP's equipment, or at least turned off the power to disconnect your connection. You then plugged everything in exactly the way it was before, and turned on your new shiny PC/Laptop etc. only to find you cant connect to the Internet.
Some ISP's, including the OP's limit their network connections by monitoring your computer's MAC Address in what's called a Bridge Table. The Bridge Table stores the MAC Address of every user connected to the ISP. When your ISP connected you, i.e., you started paying for service, you were given a bridged/bridging modem, to allow for transparent bridging. See Figure 1 (modem type and brand are irrelevant, I just needed a picture):
In Transparent Bridging your ISP can only see the MAC Address of the First Device connected past the modem. The modem's only job is to make sure you are connected properly and achieve Sync. In Figure 1's case the first device is the Desktop PC, therefore that Desktop PC's Ethernet Card MAC Address has been stored by your ISP. If you swap out PC's the MAC Address from your Old PC (stored in the Bridging Table) no longer matches the MAC Address of your new PC.
Note this also happens when you add a router, as in Figure 2. The MAC Address of the router no longer matches the MAC Address of the PC stored in the Bridging Table. In both cases, since the addresses don't match, the transparent bridge is broken, which is why the OP and others can't connect.
Now that we understand why the bridge broke, we have 2 major ways to fix the problem.
- MAC Address Cloning - This is what the OP is trying to accomplish. The first PC or device that was connected to his service contained a network card with the MAC ID of
00:E0:4C:1A:6B:3F. Using Coffer's MAC Vendor Lookup, we can determine at least who made the original Network Card, in this case, Realtek. Assuming we no longer have access to the device, we must Clone its address as seen below for Windows:
and here for NetworkManager Based Linuxes:
Taken from: How (and Why) to Change Your MAC Address on Windows, Linux, and Mac
Personally, I hate Fix Number 1, but it's the most common. It's common because some ISP support people are taught that it's normal, and the others are just lazy. As such, I consider the fix below the "more proper" fix."
Call your ISP support line, and kindly wait for a representative. Tell him or her that you bought a new PC/Laptop etc, and that you only need the Bridging Table cleared, because you know that the old MAC Address there won't match. Don't lose your temper because the representative will either respond:
that he can do that. When he asks if he can do anything else, say No, and offer to rate his call, as he responded correctly.
with no response. This is bad because he will try to lead you to Fix Number 1, after following the steps lined out in the helpdesk documents. If he does this ask for his supervisor, or another representative until you get one that responds favorably.