Re: wireless device and udev

["John W. Linville" <linville@tuxdriver.com>]

On Mon, Dec 07, 2009 at 05:26:16PM -0800, Stephen Hemminger wrote:
> The default udev persistent network rules based on hardware mac id doesn't
> work well when multiple SSID's are created on an access-point.  The command
>  iw phy phy0 interface add wlan1 type managed
> 
> is supposed to make a device name wlan1, but udev sees that it has the same
> mac address as wlan0 and gets confused leaving the device named wlan1_rename
> 
> It looks like wlanX is breaking assumptions of existing udev persistent network
> device name generation rules.  Perhaps there needs to be special case for wlanX
> devices?

Yes, probably so.  But what would it be?  Factoring-in SSID is clearly
not right for the usual case (i.e. one interface on a mobile device).
I'm not sure what else one could use as a key.

What does udev do for bridge, bond, or vlan devices?  Don't those
share MAC addresses with the underlying physical device?

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.