To begin with, this applies to cable modems connected via the ethernet adapter directly.
DOES NOT APPLY TO USB CONNECTIONS. DOES NOT APPLY TO MODEM CONNECTED THROUGH ROUTER. DOES NOT APPLY TO WIRELESS MODEM.
If you plug your modem into your PC via USB, stop doing that. You lose speed and you give away secrets.
Your cable modem gets IP based on the MAC of what it is connected TO, not the MAC of the modem itself.
If your ISP has assigned you a STATIC IP address, you're stuck with it. It's not common for them to do that, though.
If you are looking for the walkthrough for cable modem connected to router:
http://www.aspkin.com/forums/ebay-tr...ble-modem.html
[begin modem/nic]
01a. Goto
IP Chicken - Whats my IP address? ip address lookup and write your current ip address down.
02a. Change the MAC ID for the NIC (Network Interface Card).
02b. You need an application that will change your NIC MAC, unless your hardware already supports MAC changing.
If you use a windows PC, get Mac MakeUp. For the moment, you can get it from me at
http://tinyurl.com/n6du3a
If you use an Apple computer, I can't help you. But somebody probably can. Or maybe yer old pal Google.
02c. So, you just put MacMakeUp.exe on your desktop or anywhere you like. No install needed.
03a. Double-Click MacMakeUp.exe and you will see a dropdown list of every network device in your computer.
Some of these may be items you removed but did not delete the drivers for.
04a. Hit the arrow for the dropdown and find the adapter you are using with your modem.
05a. Now, look down a bit and see the line for New address. It shows the MAC currently assigned to that NIC.
06a. Change the last 4 digits manually or click on Generate Random radio button. Then click Change radio button.
If you want to spoof a NIC from a different company than the one who manufactured your NIC, you can.
On the dropdown for Manufacturer, pick something funny. I like to use German manufacturers. Change the last 4 digits.
07a. Regardless of what you did for 06a, you may see a message telling you it couldn't reset the NIC. If not, you're done.
If so, you need to do something about it. Depending on your windows version, the process will be different.
Mainly, you need to go to your Network Connections panel. When you get there, disable then immediately re-enable
the NIC we just played with. Or shutdown and restart your system. Whichever is easier for you.
08a. Goto
IP Chicken - Whats my IP address? ip address lookup and compare it to what you got from 01a. It should be different.
If it is still the same, either you missed a step or your IP is STATIC.
[end modem/nic]
NOTES:
001 Properly done, this new MAC will be remembered if and when you restart your PC. I would check this the first time around, just so you will know if your system supports the persistance of NIC MAC. If it doesn't, you'll have to run MacMakeUp every time you reboot.
002 You can go back to a previous IP by changing your MAC back to what it was for that IP, up to a point. After a few hours, you can't get it back. Some ISPs hold it in reserve for 24 hours. Some for 1 hour.
003 Every network device has a MAC address. Do not set the NIC MAC to be identical to any other MAC in your system. You will get collisions which may freeze your system or may cause your modem to go into a reboot loop. It's very annoying.