Re: Qemu and tun/tab usage - /dev/net/tun permissions

[Bob McGowan]

Mathias Brodala wrote:

Hello Bob.

Bob McGowan, 01.03.2007 20:53:

I'm trying to set up bridged networking for a Qemu guest system.  The
doc I have says I need to do a 'chmod 666 /dev/net/tun' to be able to do
this.

And, I see the permissions on it are:

crw------- 1 root root 10, 200 2007-02-27 16:28 /dev/net/tun

So, methinks, I should fix the udev configuration so it sets the
permissions to 666 rather than 600.

Only one problem.  /etc/udev/permissions.rules says:

KERNEL=="tun",                  MODE="0666"

On my system there is a /etc/udev/tun.rules file which seems to set up the
device and its permissions:

$ grep -r tun /etc/udev/* | grep 666
/etc/udev/permissions.rules:KERNEL=="tun",                      MODE="0666"
/etc/udev/rules.d/020_permissions.rules:KERNEL=="tun",                  
MODE="0666"
/etc/udev/rules.d/010_tun.rules:KERNEL=="tun", NAME="net/%k", MODE="0666"
/etc/udev/tun.rules:KERNEL=="tun", NAME="net/%k", MODE="0666"

You might want to try looking for it or creating it if necessary.


Regards, Mathias

Thanks for all the suggestions.

Bob

Thanks for the suggestion. It had no impact on device permissions or creation, when I added it. Thanks to all for your ideas. Given that I need a bit more than just this file permission change, to use tun/tap as a user, I've decided the simplest solution, for now, is to just add the commands needed to set things up in the /etc/rc.local file. This way I can run the bridge setup, tunctl, and chmod command as root during boot and so have it available whenever I need to run Qemu.

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