ProxMox if-up.d script to fix hanging Intel e1000e Gigabit NIC when a VM has a lot of network usage

hangfix-intel-e1000e

#!/bin/sh -e

# Instructions:
# Change HANGING_IFACE to match the interface name of your interface (this can
# be found by running `ifconfig -a` or `cat /etc/network/interfaces`.
# 
# Place this file in `/etc/network/if-up.d` and make sure to make it executable
# by running `chmod a+x /etc/network/if-up.d/hangfix-intel-e1000e` then reboot.
#
# After reboot, confirm it worked by running `ethtool -k eno1 | grep segmentation`
# where `eno1` is the HANGING_IFACE interface. Everything should be set to off.

HANGING_IFACE=eno1

# NOTE: Due to the defualt ProxMox network config not running scripts for eno1,
#       we instead run this when it finishes all interfaces (calls scripts again
#       with IFACE as --all).
#
#      Alternatively, we could add auto eno1 to the /network/interfaces, but I
#      don't know if that will cause other issues.
if [ "$IFACE" = "--all" ]; then
    /sbin/ethtool -K $HANGING_IFACE gso off gro off tso off tx off rx off
fi

exit 0