This is pretty neat trick. if you have a linksys router the trick where you do ipconfig /release wont work! you should try this out i hope it works for any of you that might need it.

1)Open up your web browser and go here http://192.168.1.1/wanMac.htm or http://192.168.1.1/WanMAC.asp if you cant connect to this then your Router does not support this!

2)Ok once at login screen leave the username blank and in the password box type admin, this will bring you to a new screen with 6 boxes that look like this (0.0 0.0 0.0 0.0 0.0 0.0) it may just have all 0's or have numbers and letters., click on the orange setup button @ the top right hand corner of the screen, this will bring you to another screen with various information.

3)Now look for your (LAN) MAC address it will look something like this "EXAMPLE; LAN IP (MAC Address: 00-90-4B-60-78-6E)"

4)Copy your LAN (MAC Address: 00-90-4B-60-78-6E) and hit the back button and place the LAN (MAC Address: 00-90-4B-60-78-6E)
in the 6 boxes.

""NOTE""
The numbers i have provided both above and below are for examples only do not use them!

5)Now to change your ip you have to change the last 2 boxes (MAC Address: 00-90-4B-60-xx-xx) the ones ive marked with the xx are the 2 boxes you will change.

6)Now you can use any combonation of numbers and/or letters from 0-9 to A-F in the last 2 boxes example as shown below.

""NOTE""
Only change the last 2 boxes as shown in the examples below

Example; we started with this LAN (MAC Address: 00-90-4B-60-78-6E)

Example; we can change it to this (MAC Address: 00-90-4B-60-E5-0

Example; we can change it to this (MAC Address: 00-90-4B-60-07-07)

Example; we can change it to this (MAC Address: 00-90-4B-60-FF-AA)

Caution; Do not change the first 4 boxes of the Mac Address that ive marked with an xx (MAC Address: xx-xx-xx-xx-78-6E)

You can use any combanation of numbers 0-9 or any combanation of letters A-F

7)Now unplug all your modems and routers for 30 seconds minimum.

8)After the 30 seconds have passed plug everything back in.

9)Click on your web browser and see if you can connect to the internet if you get a page that says can not be displayed message this is normal!
simply hit the reset button on the back of your linksys router and you should be good to go.

10)Now go here and you will see your new ip