新增/修改XP網卡IPv6 config

安裝IPv6功能:
dos>ipv6 install

移除:
dos>ipv6 uninstall


修改網卡的IPv6 address: /* 假定網卡的name為RealTek，要把它address手動設成2100::5 */
dos> netsh>interface>ipv6>set address interface=RealTek address=2100::5


刪除IPv6的address:
dos> netsh>interface>ipv6>delete address interface=RealTek address=2100::5