Mikeri's tech-babble

2009-03-22

IPv6 with 6to4 tunneling in Debian made easy

I tried to find an easy way to implement IPv6 via 6to4 on my Debian server, but everything I found required some sort of manual intervention in the case of reboots/new IP addresses from my ISP, etc.

So I made this little init.d script using snippets from all around:

#!/bin/sh
# $Id: tun6to4 init.d script v0.1

#Change "eth1" in the following line to your own public interface:
IPV4=$(ifconfig -a | awk '/eth1/{p=1}p&&/inet addr/{sub(".*:", "", $2);print $2;exit}')

STFADDRESS=$(printf "2002:%02x%02x:%02x%02x::1" `echo $IPV4 | tr "." " "`)

case "$1" in
start)
echo -n "Starting 6to4 tunnel: "
/sbin/ip tunnel add tun6to4 mode sit ttl 64 remote any local $IPV4
/sbin/ip link set dev tun6to4 up
/sbin/ip -6 addr add $STFADDRESS/16 dev tun6to4
/sbin/ip -6 route add 2000::/3 via ::192.88.99.1 dev tun6to4 metric 1
#The following line enables forwarding from eth0
# /sbin/ip -6 addr add dev eth0 $STFADDRESS/64
echo "."
;;
stop)
echo -n "Stopping 6to4 tunnel: "
/sbin/ip -6 route flush dev tun6to4
/sbin/ip link set dev tun6to4 down
/sbin/ip tunnel del tun6to4
echo "."
;;
restart | force-reload)
$0 stop
sleep 2
$0 start
;;
*)
echo "Usage: /etc/init.d/tun6to4 {start|stop|restart|force-reload}"
exit 1
esac
exit 0

Modify the first uncommented line with your own lan interface, save the file as /etc/init.d/tun6to4 , then do a:
$ update-rc.d tun6to4 defaults
And you should have IPv6 connectivity up and running automatically. On reboots, the script should find your DHCP assigned IP-address and use it accordingly.

If you want to forward from your LAN, uncomment the commented /sbin/ip line and change eth0 to your LAN interface.

If you get a new IP address you'll have to rerun the script. Oh, and the ipv4-extractor uses awk.

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