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#887635
ifconfig sit0 up
ifconfig sit0 inet6 tunnel ::216.66.80.30
ifconfig sit1 up
ifconfig sit1 inet6 add 2001:0470:1f0b:163::1/64
ifconfig sit1 inet6 add 2001:0470:1f0b:163::2/64
ifconfig sit1 inet6 add 2001:0470:1f0b:163::3/64
ifconfig sit1 inet6 add 2001:0470:1f0b:163::4/64
route -A inet6 add ::/0 dev sit1