Change IP address

Hi gurus

 I have an windows 2008 server with a sql 2008 r2  intance, I need to change the IP address of the windows server 

1) do I have to change the sql server 2008 IP address ? if so where do I go and do this

2) do I have to reboot the server once the IP address has been changed, or just restared all sql servers.

Thanks gurus, I am just to new to sql .