To make sure that '''tun''' module will be automatically loaded on every reboot you can also add it or into /etc/modules.conf (on RHEL see /etc/sysconfig/modules/ directory) or into /etc/sysconfig/vz-scripts/''CTID''.mount. (echo 'modprobe tun' >> /etc/sysconfig/vz-scripts/''CTID''.mount(NOTE: don't forget chmod +x + '#!/bin/sh' at the begin of mount file))