How to change the ip address on the O2 router
1) telnet to 192.168.1.254
2) log in as SuperUser / O2Br0ad64nd
3) type these lines (replace each x with a random character from 0-9 or a-f, e.g. e6:93:25:5b:c3):
ip ifdetach intf=O2_ADSL2plus
ip ifconfig intf=O2_ADSL2plus hwaddr=02:03:06:BE:AD:BE
ip ifattach intf=O2_ADSL2plus
4. Type ‘exit’ to exit the router console and get back to the command prompt.
Please be careful not to messup your router.
This might void the warrently, so always check with O2 before doing anything on their equipment.
This is just for educational purposes so I take no responsibility for the consequences of your actions.