OMV uses netplan for network config, which in turns uses the networkd service. Ask the question "how to use netplan to set NIC speed" turns up this via google: https://askubuntu.com/question…link-negotiation-settings
It's the 2nd half of the answer you want and you'll find some link file e.g.s in OMV under:/usr/lib/systemd/network
root@omvpve:/usr/lib/systemd/network# ls -l
total 44
-rw-r--r-- 1 root root 44 Feb 8 2023 73-usb-net-by-mac.link
-rw-r--r-- 1 root root 819 Jan 26 2023 80-6rd-tunnel.network
-rw-r--r-- 1 root root 937 Jan 26 2023 80-container-host0.network
-rw-r--r-- 1 root root 1023 Jan 26 2023 80-container-ve.network
-rw-r--r-- 1 root root 1009 Jan 26 2023 80-container-vz.network
-rw-r--r-- 1 root root 619 Jan 26 2023 80-ethernet.network.example
-rw-r--r-- 1 root root 970 Jan 26 2023 80-vm-vt.network
-rw-r--r-- 1 root root 697 Jan 26 2023 80-wifi-adhoc.network
-rw-r--r-- 1 root root 633 Jan 26 2023 80-wifi-ap.network.example
-rw-r--r-- 1 root root 595 Jan 26 2023 80-wifi-station.network.example
-rw-r--r-- 1 root root 769 Jan 26 2023 99-default.link
root@omvpve:/usr/lib/systemd/network#Setting the link speed via netplan is not possible, see https://bugs.launchpad.net/bugs/2020254 and https://bugs.launchpad.net/bugs/2016831.
You need to fix that manually via systemd overrides or an udev rule.
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