Network connection dropping out

[seniorimundo]

Hello,
I am new to Proxmox and my knowledge of Linux, in general, is not advanced. I can get myself around and configure things but diagnosing issues is a struggle. I have built a Proxmox 5 server with a Supermicro MBD-X11SSM-F-O motherboard which has Dual Intel® Ethernet Controller I210-AT NICs. Only using 1 NIC at present. Every so often it is dropping the network connection with the following in kern.log and messages.

Any help to diagnose and resolve this would be great. Thank you.

kern.log

Apr 12 08:05:33 pve kernel: [54331.573108] igb 0000:03:00.0: Detected Tx Unit Hang
Apr 12 08:05:33 pve kernel: [54331.573108] Tx Queue <0>
Apr 12 08:05:33 pve kernel: [54331.573108] TDH <dc>
Apr 12 08:05:33 pve kernel: [54331.573108] TDT <fe>
Apr 12 08:05:33 pve kernel: [54331.573108] next_to_use <fe>
Apr 12 08:05:33 pve kernel: [54331.573108] next_to_clean <dc>
Apr 12 08:05:33 pve kernel: [54331.573108] buffer_info[next_to_clean]
Apr 12 08:05:33 pve kernel: [54331.573108] time_stamp <100ce1872>
Apr 12 08:05:33 pve kernel: [54331.573108] next_to_watch <0000000020526f42>
Apr 12 08:05:33 pve kernel: [54331.573108] jiffies <100ce1b78>
Apr 12 08:05:33 pve kernel: [54331.573108] desc.status <1050000>​

messages

Apr 12 07:14:35 pve kernel: [51273.205499] igb 0000:03:00.0 eno1: igb: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
Apr 12 07:14:35 pve kernel: [51273.205852] vmbr0: port 1(eno1) entered blocking state
Apr 12 07:14:35 pve kernel: [51273.205855] vmbr0: port 1(eno1) entered forwarding state
Apr 12 07:25:59 pve pvedaemon[7703]: <root@pam> successful auth for user 'root@pam'
Apr 12 07:41:00 pve pvedaemon[22336]: <root@pam> successful auth for user 'root@pam'
Apr 12 07:51:18 pve kernel: [53476.536781] vmbr0: port 1(eno1) entered disabled state
Apr 12 07:51:28 pve kernel: [53485.753038] vmbr0: port 1(eno1) entered disabled state​

This is the contents on /etc/network/interfaces:

auto lo
iface lo inet loopback

iface eno1 inet manual

auto vmbr0
iface vmbr0 inet static
address 192.168.250.10
netmask 255.255.255.0
gateway 192.168.250.254
bridge_ports eno1
bridge_stp off
bridge_fd 0​

 

[Richard]

Check you hardware respectively try it with a different NIC (maybe an external one connected to an USB port, don't forget to adapt your /etc/network/interfaces accordingly).

Can be also a driver problem, but AFAIK intel I210-AT uses the igb driver which is part of pve kernel.

 

[Webhuis]

Hi,
This problem is not proxmox specific
https://superuser.com/questions/1270723/how-to-fix-eth0-detected-hardware-unit-hang-in-debian-9

I did:
ethtool -K eth0 tx off rx off
It solved the problem.