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Groups > linux.debian.user > #239477 > unrolled thread

How to avoid systemd/udev unpredictable NIC names

Started bySteve Keller <keller.steve@gmx.de>
First post2021-08-30 22:40 +0200
Last post2021-08-31 15:50 +0200
Articles 3 on this page of 23 — 12 participants

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  How to avoid systemd/udev unpredictable NIC names Steve Keller <keller.steve@gmx.de> - 2021-08-30 22:40 +0200
    Re: How to avoid systemd/udev unpredictable NIC names Greg Wooledge <greg@wooledge.org> - 2021-08-30 23:00 +0200
      Re: How to avoid systemd/udev unpredictable NIC names Andrei POPESCU <andreimpopescu@gmail.com> - 2021-08-31 12:50 +0200
        Re: How to avoid systemd/udev unpredictable NIC names Greg Wooledge <greg@wooledge.org> - 2021-08-31 13:40 +0200
        Re: How to avoid systemd/udev unpredictable NIC names Reco <recoverym4n@enotuniq.net> - 2021-08-31 16:00 +0200
          Re: How to avoid systemd/udev unpredictable NIC names Andrei POPESCU <andreimpopescu@gmail.com> - 2021-09-01 19:30 +0200
    Re: How to avoid systemd/udev unpredictable NIC names Dan Ritter <dsr@randomstring.org> - 2021-08-30 23:10 +0200
      Re: How to avoid systemd/udev unpredictable NIC names Dan Ritter <dsr@randomstring.org> - 2021-08-30 23:30 +0200
      Re: How to avoid systemd/udev unpredictable NIC names Greg Wooledge <greg@wooledge.org> - 2021-08-30 23:30 +0200
        Re: How to avoid systemd/udev unpredictable NIC names IL Ka <kazakevichilya@gmail.com> - 2021-08-30 23:50 +0200
          Re: How to avoid systemd/udev unpredictable NIC names Greg Wooledge <greg@wooledge.org> - 2021-08-31 00:10 +0200
            Re: How to avoid systemd/udev unpredictable NIC names Steve Keller <keller.steve@gmx.de> - 2021-08-31 02:10 +0200
              Re: How to avoid systemd/udev unpredictable NIC names Greg Wooledge <greg@wooledge.org> - 2021-08-31 02:50 +0200
                Re: How to avoid systemd/udev unpredictable NIC names Tixy <tixy@yxit.co.uk> - 2021-08-31 22:10 +0200
          Re: How to avoid systemd/udev unpredictable NIC names Thomas Hochstein <thh@thh.name> - 2021-08-31 00:50 +0200
        Re: How to avoid systemd/udev unpredictable NIC names Steve Keller <keller.steve@gmx.de> - 2021-08-31 01:30 +0200
          Re: How to avoid systemd/udev unpredictable NIC names <tomas@tuxteam.de> - 2021-08-31 08:30 +0200
          Re: How to avoid systemd/udev unpredictable NIC names Andrei POPESCU <andreimpopescu@gmail.com> - 2021-08-31 12:50 +0200
          Re: How to avoid systemd/udev unpredictable NIC names David Wright <deblis@lionunicorn.co.uk> - 2021-08-31 16:30 +0200
    Re: How to avoid systemd/udev unpredictable NIC names IL Ka <kazakevichilya@gmail.com> - 2021-08-30 23:30 +0200
    Re: How to avoid systemd/udev unpredictable NIC names Roberto C. Sánchez <roberto@debian.org> - 2021-08-31 01:30 +0200
      Re: How to avoid systemd/udev unpredictable NIC names Steve Keller <keller.steve@gmx.de> - 2021-08-31 02:10 +0200
    Re: How to avoid systemd/udev unpredictable NIC names George Shuklin <george.shuklin@gmail.com> - 2021-08-31 15:50 +0200

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#239492

FromRoberto C. Sánchez <roberto@debian.org>
Date2021-08-31 01:30 +0200
Message-ID<CRYT0-3TC-5@gated-at.bofh.it>
In reply to#239477
On Mon, Aug 30, 2021 at 10:20:46PM +0200, Steve Keller wrote:
> I plan to upgrade a server from	Debian stretch to buster.  Having read
> the release notes I wonder what's the best way to avoid the new scheme
> of unpredictable network interface names.
> 
> I don't	care what PCI bus and what slot	my NICs	are attached to, I
> don't want to learn and don't want to have to remember this hardware
> configurationan and I don't want to type these cumbersome and error
> prone names.  I simply have eth0 for the internal network and eth1 for
> my external network to the DSL router.  That's easy and I want to keep
> it that way.
> 
> The Debian wiki	on this	shows several ways involving kernel cmdline,
> udev, and systemd.  I've read it, I've also read some of the sparse
> and incomplete systemd documentation for almost an hour.  Still I
> don't know when and what software component (kernel, udev, systemd)
> decides the NIC names and whether and in which way these conflict each
> other. [1]
> 
> Also, after reading the	wiki it's still	unclear	to me, which of	the
> several ways will survive the next upgrade to bullseye.
> 
> The safest way seems to	be what's called "Custom schemes" but this
> section explicitly states the names eth0, etc. shouldn't be used.
> 
> So I'm still confused what to do after the upgrade to buster to	keep
> my network names.
> 

Since nobody else has mentioned this link, here is where I recommend you
start: https://wiki.debian.org/NetworkInterfaceNames

Regards,

-Roberto
-- 
Roberto C. Sánchez

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#239496

FromSteve Keller <keller.steve@gmx.de>
Date2021-08-31 02:10 +0200
Message-ID<CRZvH-4mn-5@gated-at.bofh.it>
In reply to#239492
Roberto C. Sánchez <roberto@debian.org> writes:

> Since nobody else has mentioned this link, here is where I recommend you
> start: https://wiki.debian.org/NetworkInterfaceNames

Oh, that's what I meant by "wiki" in my posts.  Sorry, I should have
given the URL.  It's linked from the buster release-notes in section
5.1.6

Steve

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#239514

FromGeorge Shuklin <george.shuklin@gmail.com>
Date2021-08-31 15:50 +0200
Message-ID<CScjf-4r7-1@gated-at.bofh.it>
In reply to#239477

[Multipart message — attachments visible in raw view] — view raw

On 30/08/2021 23:20, Steve Keller wrote:
> 't want to have to remember this hardware
> configurationan and I don't want to type these cumbersome and error
> prone names.  I simply have eth0 for the internal network and eth1 for
> my external network to the DSL router.  That's easy and I want to keep
> it that way.
>
> The Debian wiki	on this	shows several ways involving kernel cmdline,
> udev, and systemd.  I've read it, I've also read some of the sparse
> and incomplete systemd documentation for almost an hour.  Still I
> don't know when and what software component (kernel, udev, systemd)
> decides the NIC names and whether and in which way these conflict each
> other. [1]
>
> Also, after reading the	wiki it's still	unclear	to me, which of	the
> several ways will survive the next upgrade to bullseye.
>
> The safest way seems to	be what's called "Custom schemes" but this
> section explicitly states the names eth0, etc. shouldn't be used.
>
> So I'm still confused what to do after the upgrade to buster to	keep
> my network names.
>
> Steve

In my opinion explicit naming via systemd is the best:

  #/etc/systemd/network/10-persistent-net.link
  [Match]
  MACAddress=01:23:45:67:89:ab

  [Link]
  Name=eth1

Put names and macs as you wish.

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