#! /bin/sh
# written by Oliver Walter <owb@gmx.de>

localv6="$1"
password="$2"
remotev4="$3"
remotev6="$4"

while [ 1 ]
do
    hb="HEARTBEAT TUNNEL `echo -n $localv6|cut -d '/' -f 1` sender `date +%s`"
    echo -n "$hb `echo -n $hb $password|md5sum|cut -d ' ' -f 1`"|netcat -c -w 1 -u "$remotev4" 3740
    ping6 -s 8 -c 1 -q $remotev6 >/dev/null 2>&1 &
    sleep 60
done