settings access permissions below /dev accross reboots

[Hanspeter Roth]

Hello,

how can one set the file permissions of /dev/net/tun across reboots?
I have read somewhere that one can create a file /etc/udev/rules.d.
I've created /etc/udev/rules.d/10_local.rules that looks like:

  KERNEL="tun", NAME="net/%k", OWNER="root", GROUP="root", MODE="0646"

But it doesn't work. /dev/net/tun has permissions 600 after reboot.
How can I make it work?

-Hanspeter