auto he-ipv6
iface he-ipv6 inet6 v4tunnel
        address 2001:470:YY:YYYY::2
        netmask 64
        endpoint 216.218.221.6
        local xxx.xxx.x.xxx
        ttl 255
        gateway 2001:470:YY:YYYY::1

##For HE
enable-ra
dhcp-range = 2001:470:YY:YYYY::
dhcp-option=option6:dns-server,[2001:470:20::2],[2001:4860:4860::8888]