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Re: Discussion? New names of betwork devices

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My 0.02€
It's interesting how this topic is so often resurrected. The first time we
upgraded a RedHat server and the network interfaces were renamed, our
supervisor was.....angered :-)
The issue is the order of enumeration of devices on a PCI bus. Even
identical models of NIC at the same level of firmware will become ready in
non-uniform ways. Temperature plays a role, etc. If the systemd designers
(same as the udev guys, right?) made a mistake here, perhaps it was
overreach.

On Sat, Mar 23, 2019, 1:20 PM Mart van de Wege <mvdwege@gmail.com> wrote:

> Hans <hans.ullrich@loop.de> writes:
>
> > Am Freitag, 22. März 2019, 17:15:29 CET schrieb Reco:
> >> Or, for instance, en0p2gibberish. They call them Unpredictable Device
> >> Named for a reason.
> >>
> >
> > Yes, thsis is another thing, which I am thinking of: The names could
> change
> > (in case, when there are more than one network devices are active or the
> order
> > of activing changed).
>
> No. Changes in the activation order or the number of devices do not
> matter. The naming scheme is based on what bus the devices are on and
> what position on that bus they hold[1]. Once a name is assigned, unless
> you plug the card into a different slot, you will get the same name
> (note that this may not apply on hotplug architectures that don't assume
> fixed slot positions, like USB).
>
> It is the *old* way that lead to unpredictable renames unless you
> implemented udev rules to hardcode names to e.g. MAC addresses.
>
> > In the past, I forced the order with persistent- net.rules. Dunno, if
> > normal users can deal with it. Can it your Mom or your Dad? Grandpa?
> > Grandma?
> >
> Is it any worse than expecting them to write a udev rule?
>
> In the end it is a hard problem to solve because the Linux kernel does
> dynamic enumeration of devices, so you either need a deterministic
> algorithm to assign a name (ask the firmware) or a userspace workaround
> in identifying the device (e.g. using udev rules, or using UUIDs in
> /etc/fstab, etc).
>
> Mart
>
> [1] OK, not *entirely* true, it's based on what the firmware reports as
> the device position (it used to be called 'biosdevname'. Don't know if
> that still is the name in these (U)EFI times).
>
> --
> "We will need a longer wall when the revolution comes."
> --- AJS, quoting an uncertain source.
>
>

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Discussion? New names of betwork devices Hans <hans.ullrich@loop.de> - 2019-03-22 16:10 +0100
  Re: Discussion? New names of betwork devices Reco <recoverym4n@enotuniq.net> - 2019-03-22 17:20 +0100
    Re: Discussion? New names of betwork devices Hans <hans.ullrich@loop.de> - 2019-03-22 17:50 +0100
      Re: Discussion? New names of betwork devices Reco <recoverym4n@enotuniq.net> - 2019-03-22 18:30 +0100
      Re: Discussion? New names of betwork devices Mart van de Wege <mvdwege@gmail.com> - 2019-03-23 19:30 +0100
        Re: Discussion? New names of betwork devices Nicholas Geovanis <nickgeovanis@gmail.com> - 2019-03-23 20:40 +0100
        Re: Discussion? New names of betwork devices Nicholas Geovanis <nickgeovanis@gmail.com> - 2019-03-23 20:40 +0100
      Re: Discussion? New names of betwork devices David Wright <deblis@lionunicorn.co.uk> - 2019-03-24 18:20 +0100
    Re: Discussion? New names of betwork devices Hans <hans.ullrich@loop.de> - 2019-03-23 18:30 +0100
  Re: Discussion? New names of betwork devices Joe <joe@jretrading.com> - 2019-03-22 21:00 +0100
    Re: Discussion? New names of betwork devices ghe <ghe@slsware.net> - 2019-03-22 23:20 +0100
      Re: Discussion? New names of betwork devices Felix Miata <mrmazda@earthlink.net> - 2019-03-22 23:40 +0100
        Re: Discussion? New names of betwork devices deloptes <deloptes@gmail.com> - 2019-03-23 07:40 +0100
          Re: Discussion? New names of betwork devices Felix Miata <mrmazda@earthlink.net> - 2019-03-23 09:40 +0100
            Re: Discussion? New names of betwork devices David Wright <deblis@lionunicorn.co.uk> - 2019-03-24 04:10 +0100
              Re: Discussion? New names of betwork devices Felix Miata <mrmazda@earthlink.net> - 2019-03-24 04:30 +0100
                Re: Discussion? New names of betwork devices deloptes <deloptes@gmail.com> - 2019-03-24 07:30 +0100
                Re: Discussion? New names of betwork devices Felix Miata <mrmazda@earthlink.net> - 2019-03-24 08:10 +0100
                Re: Discussion? New names of betwork devices David Wright <deblis@lionunicorn.co.uk> - 2019-03-24 18:10 +0100
      Re: Discussion? New names of betwork devices Michael Stone <mstone@debian.org> - 2019-03-24 20:30 +0100
  Re: Discussion? New names of betwork devices ghe <ghe@slsware.net> - 2019-03-22 21:00 +0100

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