Change IP address :: Ubuntu

Change IP address :: Ubuntu

I am trying to access a website from an IP address that appears different than the normal one. I have tried using "sudo ifconfig 192.168.1.29 up" and successfully changed the ip address, but then I wasn't able to use Firefox, it just kept on loading. So I reset my connection, the router restored my normal IP address (It stores my MAC and gives me the same IP each time). Now I am back to where I started. Any ideas.