ProxMox LxC container open vpn Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)

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Adding the following to /etc/pve/lxc/xxx.conf solves the problem:
lxc.cgroup.devices.allow: c 10:200 rwm
lxc.mount.entry: /dev/net dev/net none bind,create=dir

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