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Fix Intel Ethernet NIC Hang

Problem

If ethernet hangs and you get this journal log:

Mar 29 05:14:04 pve-01 kernel: e1000e 0000:00:1f.6 enp0s31f6: Detected Hardware Unit Hang:
                                 TDH                  <3>
                                 TDT                  <75>
                                 next_to_use          <75>
                                 next_to_clean        <2>
                               buffer_info[next_to_clean]:
                                 time_stamp           <1525c7e78>
                                 next_to_watch        <3>
                                 jiffies              <15287e140>
                                 next_to_watch.status <0>
                               MAC Status             <40080083>
                               PHY Status             <796d>
                               PHY 1000BASE-T Status  <3800>
                               PHY Extended Status    <3000>
                               PCI Status             <10>

Symptoms: unable to connect to internet, node becomes remotely inaccessible

Solution

Edit /etc/network/interfaces with the following:

iface vmbr0 inet static
        ...
        post-up ethtool -K <ethernet device> gso off gro off tso off tx off rx off
        ...

source /etc/network/interfaces.d/*

Make sure the ethtool package is installed on the system

Sources:

https://forum.proxmox.com/threads/intel-nic-e1000e-hardware-unit-hang.106001/

https://www.reddit.com/r/Proxmox/comments/1drs89s/intel_nic_e1000e_hardware_unit_hang/

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