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auto eth0
iface eth0 inet static
        address 185.38.14.xxx
        netmask 255.255.255.0
        network 185.38.14.0
        broadcast 185.38.14.255
        gateway 185.38.14.1
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 4.2.2.1
        dns-search xxxx

auto he-ipv6
iface he-ipv6 inet6 v4tunnel
        address 2001:470:1f14:2c9::2
        netmask 64
        mtu 1280
        local 182.38.14.same as address above?
        endpoint 216.66.84.46
        ttl 255
        gateway 2001:470:1f14:2c9::1
       #dns-nameservers 2001:470:20::2

marius@merhamet:~$ sudo ifup he-ipv6
add tunnel "sit0" failed: No buffer space available
Failed to bring up he-ipv6.