linux-kernel - Re: Device naming randomness (udev?)

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Message-ID: <20061206054941.GD13118@suse.de>
Date:	Tue, 5 Dec 2006 21:49:41 -0800
From:	Greg KH <gregkh@...e.de>
To:	Bj?rn Steinbrink <B.Steinbrink@....de>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Device naming randomness (udev?)

On Mon, Dec 04, 2006 at 12:12:06AM +0100, Bj?rn Steinbrink wrote:
> On 2006.12.03 14:39:44 -0800, Martin J. Bligh wrote:
> > This PC has 1 ethernet interface, an e1000. Ubuntu Dapper.
> > 
> > On 2.6.14, my e1000 interface appears as eth0.
> > On 2.6.15 to 2.6.18, my e1000 interface appears as eth1.
> > 
> > In both cases, there are no other ethX interfaces listed in
> > "ifconfig -a". There are no modules involved, just a static
> > kernel build.
> > 
> > Is this a bug in udev, or the kernel? I'm presuming udev,
> > but seems odd it changes over a kernel release boundary.
> > Any ideas on how I get rid of it? Makes automatic switching
> > between kernel versions a royal pain in the ass.
> 
> Just a wild guess here... Debian's (and I guess Ubuntu's) udev rules
> contain a generator for persistent interface name rules. Maybe these
> start working with 2.6.15 and thus the switch (ie. the kernel would call
> it eth0, but udev renames it to eth1).
> The generated rules are written to
> /etc/udev/rules.d/z25_persistent-net.rules on Debian, not sure if its
> the same for Ubuntu. Editing/removing the rules should fix your problem.

Yes, I'd place odds on this one.

Martin, any followup?

thanks,

greg k-h
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