![]() Several workarounds for renaming interfaces grew up in the early days of hotpluggable wireless interfaces, but if they still work it'll be because like ifrename they now use udev rules under the hood. rules file (then updating the initrd before you reboot) see the udev and the more detailed guide below. If you're currently running something newer than Debian 8 "jessie" with a legacy les file but have decided to switch to the new regime, you can do that just by disabling the. However, bear in mind that you'll need to maintain it yourself, and be ready to switch to a different scheme for Debian 11 "bullseye", which lacks this legacy support. The udev on these releases still respects that file if present (and will accept a freshly created one). If you've got a working "legacy" /etc/udev/rules.d/les file and want to stick with it, you can safely upgrade through Debian 9 "stretch" and Debian 10 "buster". ![]() rules files, and claims they can rename interfaces, so what has changed?) In Debian 11 "bullseye" this is not working anymore (though details are unclear udev still accepts. The plan (still taken for granted in most of the documentation) was for it not to be supported in Debian 10 "buster", but hand-crafted. This still had subtle race conditions, required /etc to be on a writable file system, and had problems with virtualization, so it's no longer supported upstream. On Debian 10 "buster" the /lib/udev/rules.d/les file that appends to it was also missing, though legacy les files were still honored. Since Debian 9 "stretch", newly installed machines no longer start with an /etc/udev/rules.d/les file, though such files are maintained if they still exist (with new lines added for newly installed network hardware). ![]() if you were replacing a machine's sole NIC, you'd also have to take special care to ensure it took over as network interface number 0) but these were minor and predictable.Ī sample. This could have annoying side-effects (e.g. This scheme, introduced somewhere around Debian 5 "lenny", used udev to identify interfaces by MAC address and assign a fixed interface number to any interface it recognized (writing the rules to /etc/udev/rules.d/les). It's probably also possible to do this by masking enough of systemd.) (If you've still got a working legacy les file, the net.ifnames=0 flag doesn't deactivate that, so you'd need to see the instructions below for temporarily disabling that file. See the external links below on standard methods for overriding systemd configuration. there seem to be lots of ways of doing this, so make sure you haven't done it in more than one way or it'll trip you up in a couple of years when you try to undo it. The simple way of disabling the whole current interface naming scheme (which you might want to try for one-off testing) is just to boot with the kernel parameter net.ifnames=0, which can be set in an interactive grub session at boot or made persistent by editing /etc/default/grub and running update-grub.Īlternatively, you can override /lib/systemd/network/99-default.link, with a custom version in /etc/systemd/network/, or similarly override /lib/udev/rules.d/les, or mask the latter by using a /dev/null symlink instead of a custom version, or. If you wipe out all other name-assignment mechanisms then you'll be left with this one. As boot processes became less linear and interfaces became more hotpluggable this became more of a concern. How to migrate to this scheme on upgraded systemsīack in the nineties, eth0, eth1, etc were simply assigned by the kernel.Īt least in theory, if module probes completed in a different order, eth0 and eth1 might switch places on successive boots.
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