I dont know how to link to other peoples posts but this is the guide I used:
08-01-2009, 12:57 AM
Vicvelcro
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How to change IP address if you have a ROUTER and a CABLE MODEM
To begin with, this applies to cable modems connected via the ethernet port to a router.
DOES NOT APPLY TO USB CONNECTIONS. DOES NOT APPLY TO MODEM CONNECTED DIRECT TO NETWORK ADAPTER.
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 directly to NIC:
How to change IP address if you have a CABLE MODEM connected to your NIC
[begin modem/router]
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 ROUTER.
02b. Open your browser and enter the information to access the web-setup to your router (usually
http://192.168.1.1)
You can find this in your router manual or by viewing the status of your ethernet. It is your default gateway.
02c. You may get a popup asking for login name and password. If you didn't change it, try admin admin or admin and blank.
Different routers have different factory default login/password. Google 'router default password <your brand>'.
03a. Look around in the setup for the option for MAC address. Some routers have many MAC addresses. you need WAN MAC.
If you only find one MAC setting, obviously that's the one you want.
04a. Do NOT choose to clone any MAC already in your system. Change the numbers in the last 2 pairs as you wish.
MAC is in this format - xx:xx:xx:xx:xx:xx - and the first 4 sets need to stay as they are. The last pairs change.
You can make those any hex numbers between 00-FF. Set this manually. Don't CLONE anything.
05a. After you change, you need to save the settings. So click save.
06a. You can either reboot the router or you can Release DHCP then Renew DHCP from the router, if you see the option.
07a. Regardless of what you did for 06a, unplug and replug your MODEM while the router is still doing it's thing.
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/router]
NOTES:
001 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. Orion has a great thread going for this. See HOW TO: Change Cable Modem IP Addresses to CONTROLLED NUMBERS
002 Different routers put the MAC on different pages. It's in there somewhere.
003 Every network device has a MAC address. Do not set the router 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. It may lock you out of your router.
004 For DSL, go see ebayhateluv's excellent thread here **DSL MODEM + LINKSYS ROUTER**- HERE'S How to change ip address!!
Last edited by Vicvelcro; 08-01-2009 at 09:17 PM.
Like I said Mac.fee, this worked for me a year or so ago and I know a most people on Virginmedia have the same equipment so it ought to work now. One thing I'd suggest though is before you change anything just keep a record of what your original configuration was incase you need to go back to it. If you start changing your MAC address and it goes wrong then you wont get your details back unless you've recorded them. Good luck!
IP Tracking by Paypal/Ebay 
ig/release and ipconfig/renew, switch the router off and then on and I have a new IP.
