I am trying to set up a Hurricane IPv6 tunnel on my Ubuntu 11.10 computer. I have set up my /etc/network/interfaces file as stated on https://wiki.ubuntu.com/IPv6#Get_connected_with_Hurricane_Electric.

My /etc/network/interfaces file is the following:

auto lo

iface lo inet loopback



auto he-ipv6

iface he-ipv6 inet6 v4tunnel

      endpoint 209.51.161.14

      address  2001:470:1f06:6::2/64

      netmask  64

      up ip -6 route add default dev he-ipv6

      down ip -6 route del default dev he-ipv6

When I try to start IPv6 by running sudo ifup he-ipv6, I receive the following:

add tunnel sit0 failed: No buffer space available

Failed to bring up he-ipv6.

I have double checked that the data I entered from Hurricane is correct. What is causing this problem, and how can I fix it?