You To make sure that '''tun''' module will be automatically loaded on every reboot you can also add it or into /etc/modules.conf to make sure it will be loaded (on every reboot automatically. (On RHEL create a script : echo 'modprobe tun' >> /etc/sysconfig/modules/tun.modules)or into /etc/sysconfig/vz-scripts/''VEID''.mount. (echo 'modprobe tun' >> /etc/sysconfig/vz-scripts/''VEID''.mount)