Problems with ipv6 tunnel

[uinpusdatin1]

Hi there, i've some error regarding the ipv6 tunneling... i used ubuntu 10.04

here is my /etc/network/interfaces:
auto he-ipv6
iface he-ipv6 inet6 v4tunnel
        endpoint 216.218.221.42
        address 2001:470:35:270::2
        netmask 64
        local 202.47.88.76
        gateway 2001:470:35:270::1
        ttl 255

and try to tunnel with some errors:
#ip tunnel add he-ipv6 mode sit remote 216.218.221.42 local 202.47.88.76 ttl 255
   ioctl: no buffer space available
#ip link set he-ipv6 up
   RTNETLINK answers: File exists
#ip addr add 2001:470:35:270::2/64 dev he-ipv6
#ip route add :0 dev he-ipv6
   Error: an inet prefix is expected rather than ":0".
#ip -f inet6 addr
   1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
   3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 fe80::4a5d:60ff:fe53:2f6b/64 scope link
       valid_lft forever preferred_lft forever
   5: he-ipv6: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1480
    inet6 2001:470:35:270::2/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::a32:54/128 scope link
       valid_lft forever preferred_lft forever

[cholzhauer]

http://www.sixxs.net/forum/?msg=setup-981289