while [ -z $localip ]
do {
sleep 1
localip=`ifconfig eth0|awk '/inet /{print $2}'|awk -F: '{print $2}'`
}
done
echo Local IP Address: $localip
sleep 3
echo Setting up IPv6...
sudo ip tunnel del sit1
sudo ip tunnel add sit1 mode sit remote 10.100.1.85 local $localip
sudo ifconfig sit1 up
sudo ifconfig sit1 add 2001:da8:203:888:0:5efe:$localip/64
sudo ip route add ::/0 via 2001:da8:203:888::1 metric 1