Re: [Astlinux-users] When is '/etc/udev/rules.d/70-persistent-net.rules' created

[Michael K. <mic...@ip...>]

Thanks Lonnie

So considering my MAC addresses are fa:16:3e:* could I comment out the following line from this file and reboot:

# do not use "locally administered" MAC address
# ENV{MATCHADDR}=="?[2367abef]:*", ENV{MATCHADDR}=""

I would only edit for multi interface VM’s which are currently only our softswitch servers.

What do you think? Or I could just build a manual one?


Regards

Michael Knill



From: Lonnie Abelbeck <li...@lo...>
Date: Wednesday, 27 August 2025 at 10:27 am
To: AstLinux Users Mailing List <ast...@li...>
Subject: Re: [Astlinux-users] When is '/etc/udev/rules.d/70-persistent-net.rules' created

Hi Michael,

That [1] file is generated by this udev rule:
--
/usr/lib/udev/rules.d/75-persistent-net-generator.rules
--
Not trivial to follow, but you can see how some interfaces are skipped.

For many VM guests, no [1] file is auto-generated.

None of my KVM Hypervisor Guest VMs have a [1] file.  Though in all cases the first interface is "eth0".

I have never needed it, but you could add a manual [1] file (with specific MAC addresses) if needed.

Lonnie

[1] /etc/udev/rules.d/70-persistent-net.rules



> On Aug 26, 2025, at 6:54 PM, Michael Knill <mic...@ip...> wrote:
>
> Hi All
>
> Im just wondering when '/etc/udev/rules.d/70-persistent-net.rules’ is created. I have Astlinux in an OpenStack VM and the NIC assignments appear to be pretty random and Im concerned that they could change on a reboot.
>
> I looked for this file but I could not find it:
> 12810-IPCPROD-SSFE1 kd # ls -la /etc/udev/rules.d/
> total 24
> drwxrwxr-x    1 root     root           120 Jul  5  2023 .
> drwxrwxr-x    1 root     root            80 Jul  5  2023 ..
> -rw-r--r--    1 root     root         11589 Jul  5  2023 62-nut-usbups.rules
> -rw-r--r--    1 root     root           753 Jul  5  2023 dahdi.rules
> -rw-r--r--    1 root     root           185 Jul  5  2023 usbtty.rules
> -rw-r--r--    1 root     root           531 Jul  5  2023 xpp.rules
>
> I thought this file was auto created as I usually have to delete it if I change NIC’s so wondering how it all works?
>
> Regards
>  Michael Knill
> Managing Director
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