#!/bin/bash

# Create a 6to4 tunnel in linux.

if [ $# -eq 0 ]
then
  echo "Usage: $0 <wan interface name> [delete]"
  exit
fi

ipv4=$(ifconfig $1|grep "inet addr:"|awk '{print $2}'|awk -F: '{print $2}')
ipv6=$(printf "2002:%02x%02x:%02x%02x::1" `echo $ipv4 | tr "." " "`)
echo "ipv4 address: ${ipv4}"
echo "ipv6 address: $ipv6"

if [ "$2" = "delete" ]
then
  /sbin/ip link set dev tun6to4 down || echo duh
  /sbin/ip -6 route flush dev tun6to4  || echo hrm
  /sbin/ip tunnel del tun6to4 || echo huh
  echo "IPv6 tunnel has been deleted."
  exit
fi

/sbin/ip tunnel add tun6to4 mode sit ttl 255 remote any local 173.14.178.146
/sbin/ip link set dev tun6to4 up
/sbin/ip -6 addr add ${ipv6}/16 dev tun6to4
/sbin/ip -6 route add 2000::/3 via ::192.88.99.1 dev tun6to4 metric 1
if ping6 -c 1 he.net 2>&1 1>/dev/null
then
  echo "Verified IPv6 connectivity."
else
  echo "Can't ping IPv6 network."
fi