Hello,
I'm trying to get IPv6 tunnel up.

I did go through Google and a few topics, namely - http://www.linode.com/forums/viewtopic.php?t=5629 and http://www.linode.com/wiki/index.php/IPv6#Debian. I tried following it but every time I try to restart it, I get the following near the end:

if-up.d/mountnfs[eth0]: waiting for interface hetunnel before doing NFS mounts (warning).
ioctl: No buffer space available
Failed to bring up hetunnel.
done.

Here's what I currently have (after reverting many changes and some comments lying around for when I tried them):

auto lo
iface lo inet loopback

#auto eth0
#iface eth0 inet static
#    address 69.164.218.172
#    netmask 255.255.255.0
#    broadcast 69.164.218.255
#    gateway 69.164.218.1
auto eth0
iface eth0 inet dhcp

#iface eth0 inet6 static
#    address fe80::fcfd:45ff:fea4:daac
#    netmask 64

auto hetunnel
iface hetunnel inet6 v4tunnel
    address 2001:470:1f06:d98::2
    netmask 64
    endpoint 209.51.161.14
    local 69.164.218.172
    gateway 2001:470:1f06:d98::1
    ttl 64

If I uncomment out the inet6 for eth0, I get:

if-up.d/mountnfs[eth0]: waiting for interface hetunnel before doing NFS mounts (warning).
SIOCSIFADDR: File exists
Failed to bring up eth0.
ioctl: No buffer space available
Failed to bring up hetunnel.
done.

Any help is most appreciated.

Thank you very much!

Ah nevermind. I solved it thanks to deaton's help.

$ sudo ip -6 tunnel del <tunnel>

And then I re-ran `sudo /etc/init.d/networking restart' and it's working.