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Proxmox | Fix "e1000e Detected Hardware Unit Hang"
Proxmox Virtual Environment 6.1-3 / Debian 10 (buster)
Kernel 5.3.10-1-pve
Ethernet controller: Intel Corporation Ethernet Connection (2) I218-V (rev 05)
Ethernet driver: e1000e 3.2.6-k
Ethernet firmware: 0.1-4

The solution I've found was to create a oneshot service which disables segmentation offloading.

sudo apt update && apt -y install ethtool

Create the file /usr/lib/systemd/system/fix-e1000e.service with the following content:

Description="Fix for ethernet hang errors"

ExecStart=/usr/sbin/ethtool -K NETWORK_INTERFACE tso off gso off

systemctl daemon-reload
systemctl enable fix-e1000e
systemctl start fix-e1000e

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@fribse fribse commented Sep 30, 2020

Looked good, but when trying it I get:

The unit files have no installation config (WantedBy=, RequiredBy=, Also=,
Alias= settings in the [Install] section, and DefaultInstance= for template
units). This means they are not meant to be enabled using systemctl.

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