Re: "Ethernet trouble" thread
On Mon, Feb 3, 2020 at 2:54 PM Greg Wooledge <wooledg@eeg.ccf.org> wrote:
> On Sat, Feb 01, 2020 at 05:45:26PM +0100, Tom H wrote:
>>
>> You state that it's no longer udev that renames NICs. The following's
>> from a sid VM using svsinit+sysvrc.
> [...]
>> udev is renaming "eth0".
>>
>> You can still use "/etc/udev/rules.d/" to rename NICs. Just like with
>> "/etc/systemd/network/*.link", you gain simple names linked to a NIC's
>> MAC address, but lose the predictable names' advantage that swapiing
>> out a NIC preserves its name.
>
> Yes, it MIGHT still work. Or it might not. Support for it has
> been officially removed. Whatever the 70-persistent-net.rules file
> does on your system is unique to your system.
>
> https://wiki.debian.org/NewInBuster#Network_interface_name_migration
>
> "The buster release notes warn that the
> /etc/udev/rules.d/70-persistent-net.rules method for assigning
> persistent network interface names is no longer supported."
>
> https://www.debian.org/releases/buster/amd64/release-notes/ch-information.en.html#migrate-interface-names
>
> "If your system was upgraded from an earlier release, and still uses
> the old-style network interface names that were deprecated with stretch
> (such as eth0 or wlan0), you should be aware that the mechanism of
> defining their names via /etc/udev/rules.d/70-persistent-net.rules is
> officially not supported by udev in buster (while it may still work
> in some cases)."
Thanks. Even though this is the official policy/statement, I don't buy it.
The problem's that "70-persistent-net.rules" has been used to rename
NICs within the kernel "ethX" namespace. Until udev upstream declares
the "SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="mac_address",
NAME="net0" syntax and mechanism deprecated/obsoleted, I'll assume
that the Debian release notes and wiki are wrongly melding the fact
that renaming a NIC to "ethX" is deprecated (and that it might not
work in the future), with the fact that
"/etc/udev/rules.d/<something>.rule" can still be used to associate a
NIC's MAC address with a name.
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