IPv6 over IPv4 via OpenVPN Client nicht über internet erreichbar

#!/bin/bash
# This is a script that is run each time a remote client connects
# to this openvpn server.
# it will setup the ipv6 tunnel depending on the ip address that was
# given to the client
 
BASERANGE="ffff:ffff:ffff"  
# v6net is the last section of the ipv4 address that openvpn allocated
V6NET=$(echo ${ifconfig_pool_remote_ip} | awk -F. '{print $NF}')  
SITID="sit${V6NET}"  
# setup the sit between the local and remote openvpn addresses
sudo /sbin/ip tunnel add ${SITID} mode sit ttl 255 remote ${ifconfig_pool_remote_ip} local ${ifconfig_local}
sudo /sbin/ip link set dev ${SITID} up
# config routing for the new network
sudo /sbin/ip -6 addr add ${BASERANGE}:${V6NET}::1/64 dev ${SITID}
sudo /sbin/ip -6 route add ${BASERANGE}:${V6NET}::/64 via ${BASERANGE}:${V6NET}::2 dev ${SITID} metric 1

 
#!/bin/bash
# script that is run on the client when it creates a tunnel to the remote OpenVPN server
echo up.sh
 
IPV6BASE=ffff:ffff:ffff
V6NET=$(echo ${ifconfig_local} | awk -F. '{print $NF}')  
# NOTE!!! The following has a hard coded ipv4 address because I can not find a way for the client to find out the server ipv4 end point of the OpenVPN tunnel
echo "######################################################################################"  
/sbin/ip tunnel add sit1 mode sit ttl 255 remote 10.6.0.1 local ${ifconfig_local}
echo first fine
/sbin/ip link set dev sit1 up
echo 2nd
/sbin/ip -6 addr add ${IPV6BASE}:${V6NET}::2/64 dev sit1
echo 3rd fine
/sbin/ip route add ::/0 via ${IPV6BASE}:${V6NET}::1
exit 0