Wired connections disconnects on high bandwith usage

Question

Wired Connection on Ubuntu 18.04 keeps disconnecting every 5 min or also on high bandwith usage. I changed the cable and its still the same problem. When I use the same cable on older laptop it's working well. I found the following syslog:

Apr 28 20:41:42 sys-19 kernel: [   99.772408] e1000e: eno2 NIC Link is Down

-

 *-network:1
   description: Ethernet interface
   product: Ethernet Connection (7) I219-V
   vendor: Intel Corporation
   physical id: 1f.6
   bus info: pci@0000:00:1f.6
   logical name: eno2
   version: 10
   serial: 04:23:26:d3
   size: 100Mbit/s
   capacity: 1Gbit/s
   width: 32 bits
   clock: 33MHz
   capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.5-4 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
   resources: irq:123 memory:a1200000-a121ffff



lspci -knn | grep Eth -A2

Ethernet controller [0200]: Intel Corporation Ethernet Connection (7) I219-V [8086:15bc] (rev 10)
Subsystem: ASUSTeK Computer Inc. Ethernet Connection (7) I219-V [1043:8672]
Kernel driver in use: e1000e
Kernel modules: e1000e

Please, help me to fix this issue. Thank you..

Answer 1

If it's not a general network problem, then this might be caused by autonegotation or/and DHCP server issues.

Try to disable autonegotation with ethtool.

Keep in mind that this might cut off network depending on your configuration.

sudo apt-get update && sudo apt-get install ethtool
ethtool -s eno2 autoneg off

or

ethtool -s eno2 speed 1000 duplex full autoneg off

Where 1000 is your NIC speed: 1000 for 1 Gpbs, or 100 for 100 Mbps.

This can also have something to do with power saving, so you may want to try disabling ACPI: How do I disable ACPI when booting?

Answer 2

In terminal, use the nm-connection-editor, set the "Link negotiation" to "manual/100Mb/full".