Thanks Lonnie
Will probably do 2)
Regards
Michael Knill
From: Lonnie Abelbeck <li...@lonnie.abelbeck.com>
Date: Saturday, 30 August 2025 at 12:31 am
To: AstLinux Users Mailing List <astlinux-users@lists.sourceforge.net>
Subject: Re: [Astlinux-users] When is
'/etc/udev/rules.d/70-persistent-net.rules' created
Hi Michael,
Possible solutions ...
1) (most desirable IMO)
Use only one NIC for the VM, and use VLAN(s) (ex. eth0.10, eth0.20) for the
additional interfaces/subnets.
2)
Manually create the '/etc/udev/rules.d/70-persistent-net.rules' file with the
static "fa:16:3e:*" MACs.
3) (least desirable IMO)
It does seem the "fa:16:3e:*" MAC is common to Red Hat OpenStack, so
'/usr/lib/udev/rules.d/75-persistent-net-generator.rules' could be patched in
the build system for the udev package... (untested)
--- udev-3.2.14/rule_generator/75-persistent-net-generator.rules.orig
2025-08-29 09:24:02.162262410 -0500
+++ udev-3.2.14/rule_generator/75-persistent-net-generator.rules 2025-08-29
09:26:03.782398817 -0500
@@ -61,6 +61,8 @@
ENV{MATCHADDR}=="52:54:ab:*", GOTO="globally_administered_whitelist"
# Kingston Technologies
ENV{MATCHADDR}=="e2:0c:0f:*", GOTO="globally_administered_whitelist"
+# Red Hat OpenStack VM
+ENV{MATCHADDR}=="fa:16:3e:*", GOTO="globally_administered_whitelist"
# match interface dev_id
ATTR{dev_id}=="?*", ENV{MATCHDEVID}="$attr{dev_id}"
Lonnie
> On Aug 28, 2025, at 10:05 PM, Michael Knill
> <michael.kn...@ipcsolutions.com.au> wrote:
>
> Ok I have found out from my provider that their MAC addresses are static and
> using the MAC address is how they recommend sorting out this issue.
> They mentioned the issue stems from the fact they cannot control which order
> Openstack adds the NICs to the VM, which in turn can cause the PCI address to
> change, and the kernel will rename devices based on that.
>
> As such, would you think it would be reasonable to manually create this file
> or could I modify the existing generator file or add a new one to
> automatically add it in?
>
> Regards
> Michael Knill
> From: Michael Knill <michael.kn...@ipcsolutions.com.au>
> Date: Thursday, 28 August 2025 at 3:39 pm
> To: AstLinux Users Mailing List <astlinux-users@lists.sourceforge.net>
> Subject: Re: [Astlinux-users] When is
> '/etc/udev/rules.d/70-persistent-net.rules' created
>
> Thanks Lonnie
>
> I will confirm if the MAC’s change or not from the provider.
>
> Regards
> Michael Knill
> From: Lonnie Abelbeck <li...@lonnie.abelbeck.com>
> Date: Thursday, 28 August 2025 at 12:08 am
> To: AstLinux Users Mailing List <astlinux-users@lists.sourceforge.net>
> Subject: Re: [Astlinux-users] When is
> '/etc/udev/rules.d/70-persistent-net.rules' created
>
> Michael,
>
> If the VM host MACs are changing from reboot to reboot, the
> 70-persistent-net.rules must not be generated, as that would cause problems.
> Single NIC would not matter in this case, but multiple NICs are at the mercy
> of the VM host consistently maintaining the NIC order.
>
> I presume you are not seeing a problem with an OpenStack VM host, but you are
> just thinking ahead.
>
> FYI, here are some sample guest VM instances:
>
> ## Proxmox KVM (70-persistent-net.rules generated)
> pbx-pve ~ # mac2vendor bc:24:11
> Proxmox Server Solutions GmbH
>
> ## Linode KVM (no 70-persistent-net.rules)
> linode ~ # mac2vendor f2:3c:91
> Randomized MAC Address
>
> ## Vultr KVM (no 70-persistent-net.rules)
> vultr ~ # mac2vendor 56:00:01
> Randomized MAC Address
>
> ## UTM QEMU (no 70-persistent-net.rules)
> pbx-macos ~ # mac2vendor ee:df:27
> Randomized MAC Address
>
> Both Proxmox KVM and UTM QEMU can define the MAC address in the
> configuration, as such it is static.
>
> Both Linode KVM and Vultr KVM interface MACs do not change from reboot to
> reboot.
>
> Lonnie
>
>
>
> > On Aug 27, 2025, at 2:09 AM, Michael Knill
> > <michael.kn...@ipcsolutions.com.au> wrote:
> >
> > 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...@lonnie.abelbeck.com>
> > Date: Wednesday, 27 August 2025 at 10:27 am
> > To: AstLinux Users Mailing List <astlinux-users@lists.sourceforge.net>
> > 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
> > > <michael.kn...@ipcsolutions.com.au> 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
> > > D: +61 2 6189 1360
> > > P: +61 2 6140 4656
> > > E: michael.kn...@ipcsolutions.com.au
> > > W: ipcsolutions.com.au
> > > <image001.png>Smarter Business Communications
> > > _______________________________________________
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> > > https://lists.sourceforge.net/lists/listinfo/astlinux-users
> > >
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> > > pay...@krisk.org.
> >
> >
> >
> >
> > _______________________________________________
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> >
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>
>
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>
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_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/astlinux-users
Donations to support AstLinux are graciously accepted via PayPal to
pay...@krisk.org.
_______________________________________________
Astlinux-users mailing list
Astlinux-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/astlinux-users
Donations to support AstLinux are graciously accepted via PayPal to
pay...@krisk.org.
