On 2016-05-05 20:50:18 -0500, David Wright wrote:
> On Fri 06 May 2016 at 00:57:35 (+0200), Vincent Lefevre wrote:
> > On 2016-05-02 08:49:20 -0500, David Wright wrote:
> > > On Mon 02 May 2016 at 11:28:47 (+0200), Vincent Lefevre wrote:
> > > > What is the rule for interface naming when doing USB tethering
> > > > on Debian/unstable (with systemd)?
> > > >
> > > > In December, I had enx02060b0e3333, but yesterday, I had enp0s20u2.
> > > > Isn't the interface supposed to be fixed?
> > >
> > > Not fixed; but predictable. See:
> > > https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
> > >
> > > It would appear you have moved from scheme 4 to scheme 3, ie from
> > > 4. Names incorporating the interfaces's MAC address (example:
> > > enx78e7d1ea46da)
> > > to
> > > 3. Names incorporating physical/geographical location of the connector of
> > > the hardware (example: enp2s0)
> >
> > Any reason why? I haven't changed anything in my configuration.
>
> Difficult for me to say. The only jessie I'm running at present is an
> upgrade from squeeze/wheezy and Debian policy is AFAIK to leave things
> as they are. You have to install jessie afresh for Debian to use the
> new methods automatically.
Yes, it was jessie that was installed in the first place, in June 2015.
Then I immediately tracked unstable.
But the new methods are not in jessie yet (that's why I still have
eth0, because it was seen before I switched to unstable).
> > How can I move back to scheme 4? With a .link file? Scheme 3 doesn't
> > make sense for USB tethering, because there are various USB ports,
> > and anyone can be used.
>
> The last paragraph under the heading "What precisely has changed in v197?"
> says "This combined policy is only applied as last resort. That means,
> if the system has biosdevname installed, it will take precedence. If
> the user has added udev rules which change the name of the kernel
> devices these will take precedence too. Also, any distribution
> specific naming schemes generally take precedence." So I'm guessing
> that that is what locks in my "eth0"/"wlan0" names. I assume the file
> concerned is /etc/udev/rules.d/70-persistent-net.rules which has the
> lines:
>
> # PCI device 0x14e4:0x1600 (tg3)
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
> ATTR{address}=="00:1c:23:12:34:56", ATTR{dev_id}=="0x0", ATTR{type}=="1",
> KERNEL=="eth*", NAME="eth0"
>
> # PCI device 0x8086:0x4222 (iwl3945)
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
> ATTR{address}=="00:1c:bf:12:34:56", ATTR{dev_id}=="0x0", ATTR{type}=="1",
> KERNEL=="wlan*", NAME="wlan0"
>
> The machine which uses a netgear dongle has:
>
> # USB device 0x:0x (ndiswrapper)
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
> ATTR{address}=="c4:3d:c7:12:34:56", ATTR{dev_id}=="0x0", ATTR{type}=="1",
> KERNEL=="wlan*", NAME="wlan0"
>
> So you might want a line that looks like (using my mangled addresses):
>
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
> ATTR{address}=="c4:3d:c7:12:34:56", ATTR{dev_id}=="0x0", ATTR{type}=="1",
> KERNEL=="wlan*", NAME="enxc43dc7123456"
This was mainly for jessie. I thought that this file was more or less
obsolete for unstable (and the next stable). So, what is better? This
/etc/udev/rules.d/70-persistent-net.rules file? A .link file[*]?
Something else? Is there official documentation?
[*] https://www.freedesktop.org/software/systemd/man/systemd.link.html
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
