Proposed F19 Feature: systemd/udev Predictable Network Interface Names

[Dan Williams]

On Tue, 2013-01-29 at 18:29 +0000, Matthew Garrett wrote:
> On Tue, Jan 29, 2013 at 12:13:37PM -0600, Andrew McNabb wrote:
> > On Tue, Jan 29, 2013 at 06:11:19PM +0000, Matthew Garrett wrote:
> > > 
> > > Walk /sys/class/net, filter on type, filter out bridges, filter out 
> > > wireless if you want to. sysfs should have all the information you need 
> > > without name-based heuristics.
> > 
> > You have added confirmation that any attempt to figure out the name of
> > the interface is an ugly brittle mess. ;)
> 
> What is "The ethernet device"? It's the device that speaks ethernet and 
> which isn't wireless or a bridge. The correct way to identify it is to 
> look for devices that speak ethernet and which aren't wireless or 
> bridges.

Except then you run into phones or WWAN cards that show up as Ethernet
devices, but aren't really Ethernet but just IP-in-8023-frames because
that was easier to do on Windows.  That one is quite fun, and there's no
good way to catch them all.  We're obviously behind by marking them
FLAG_WWAN in the kernel, which has to be done by device IDs, becasue
some devices use standard cdc-ether or cdc-eem and you can't reliably
tell them apart from some random D-Link DUB100.

Dan