Problem solved !
forgot to disable kernel RP filter.
echo "" >> /etc/sysctl.conf
echo "# rp_filter" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.rp_filter = 0" >> /etc/sysctl.conf
echo "net.ipv4.conf.tunl0.rp_filter = 0" >> /etc/sysctl.conf
echo "net.ipv4.conf.tun0.rp_filter = 0" >> /etc/sysctl.conf
Steffen
forgot to disable kernel RP filter.
echo "" >> /etc/sysctl.conf
echo "# rp_filter" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.rp_filter = 0" >> /etc/sysctl.conf
echo "net.ipv4.conf.tunl0.rp_filter = 0" >> /etc/sysctl.conf
echo "net.ipv4.conf.tun0.rp_filter = 0" >> /etc/sysctl.conf
Steffen