That won't help if they banned his IP range and that is controled by his ISP. Get something like "BULLDOG" that masks your Ip or lets you give a false one.
PS if he is running on WinNT, 2000, or XP the command is IPCONFIG then IPCONFIG /RELEASE , IPCONFIG /RENEW. To get a new lease.
Xiao Ao Jiang Hu Zhi Dong Fang Bu Bai (Laughing Proud Warrior Invinsible Asia) Emporer of Baji!!! THE FIRST LINE OF DEFENSE AGAINST THE UNITED AUSSIE FRONT!!