怎么配置ipv6啊?
[root@vps ~]# ifconfig sit0 up
sit0: unknown interface: No such device
[root@vps ~]# ifconfig sit0 inet6 tunnel ::66.220.18.42
SIOGIFINDEX: No such device
[root@vps ~]# ifconfig sit1 up
sit1: unknown interface: No such device
[root@vps ~]# ifconfig sit1 inet6 add 2001:470:c:72f::2/64
SIOGIFINDEX: No such device