#!/bin/bash

### The global IPv4 address for your host:
GLOB_IP4=$1

### Compute the 6TO4 tunnel IPv6 address:
GLOB_IP6TO4=$(printf "2002:%x%02x:%x%02x::1" $(echo $GLOB_IP4 | tr . ' '))

### Setup the tunnel
ip tunnel add tun6to4 mode sit remote any local $GLOB_IP4 ttl 64
ip link set dev tun6to4 up
ip addr add $GLOB_IP6TO4/16 dev tun6to4
ip route add 2000::/3 via ::192.88.99.1 dev tun6to4 metric 1024