IPv6 on linux tunel bt exact

Mene pa zanima če kdo zna skonfigurirati script za tunel broker bt exact za linux
script zgleda takole:

#!/bin/sh
if ! [ -f /proc/net/if_inet6 ]
then echo "IPv6 is not installed!" 1>&2; exit 1; fi
ifconfig sit0 up
&& ifconfig sit0 inet6 tunnel ::213.121.24.85
&& ifconfig sit1 inet6 add 2001:618:400::52c0:2d86/128
&& route -A inet6 add ::/0 gw fe80::d579:1855 dev sit1
&& route -A inet6 add 2000::/3 gw fe80::d579:1855 dev sit1
&& ifconfig eth1 up
&& ifconfig eth1 inet6 add 2001:618:400:69ae::/64
&& echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
&& echo 'interface eth1
{
AdvSendAdvert on;
prefix 2001:618:400:69ae::/64
{
AdvOnLink on;
AdvAutonomous on;
};
};' > /etc/radvd.conf
&& /etc/init.d/radvd start
&& echo "IPv6 configuration completed" ||
{ echo "IPv6 configuration failed!" 1>&2; exit 1; }

ko hočem zagnati script mi ven vrže tole

root@darkstar:~# ./my66ipv6
eth1: unknown interface: No such device
IPv6 configuration failed!

pa ne vem kaj je narobe