eth0 changes from 1000 to 100Mbit

[absolut]

just realized that for some strange reason my ethernet NIC changes from 1Gbit to 100Mbit

anybody has an idea how to fix this behavior? i would like to have 1Gbit within my network, especially due to communication with NAS

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root@sidbox:[/home/absolut]# dmesg | grep eth
[    0.939314] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) d0:50:99:73:d0:74
[    0.939317] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[    0.939349] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF
[    4.083717] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    4.300173] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    7.178634] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[    7.178678] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   12.083049] e1000e: eth0 NIC Link is Up 100 Mbps Half Duplex, Flow Control: None
[   12.083058] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO
root@sidbox:[/home/absolut]# ethtool eth0 | grep Speed
        Speed: 100Mb/s


[absolut]

just kicked my NIC manually to 1000Mbit with this commend:

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ethtool -s eth0 speed 1000 duplex full
originally, that was not required. i wonder why my machine would switch to 100Mbit half duplex at all... :/

anybody able to reproduce?

best
absolut

[Geier0815]

Problem with your router or switch?

[absolut]

hm, it does not look the router is at fault here... synology NAS reports 1000MBit/s, and the workstation runs also at 1000 (need to check after reboot). maybe the cable?

i'll be testing... for now consider the issue in "monitoring" state...

thanks
absolut

[dibl]

Using e1000 here on a new installation of patience:

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root@dibl-patience:/# dmesg | grep enp0s31f6
[    1.214053] e1000e 0000:00:1f.6 enp0s31f6: renamed from eth0
[    4.101359] br0: port 1(enp0s31f6) entered blocking state
[    4.101360] br0: port 1(enp0s31f6) entered disabled state
[    4.101386] device enp0s31f6 entered promiscuous mode
[    7.314333] e1000e: enp0s31f6 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[    7.314382] br0: port 1(enp0s31f6) entered blocking state
[    7.314382] br0: port 1(enp0s31f6) entered forwarding state
root@dibl-patience:/# ethtool enp0s31f6 | grep Speed
        Speed: 1000Mb/s
root@dibl-patience:/#
Seems stable.

[absolut]

some more insights from today below... i think more and more towards the Ethernet cable. need to find a replacement and check it after that

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root@sidbox:[/home/absolut]# dmesg | grep eth
[    0.939314] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) d0:50:99:73:d0:74
[    0.939317] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[    0.939349] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF
[    4.083717] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    4.300173] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    7.178634] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[    7.178678] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   12.083049] e1000e: eth0 NIC Link is Up 100 Mbps Half Duplex, Flow Control: None
[   12.083058] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO
[  311.104061] e1000e: eth0 NIC Link is Down
[  318.134169] e1000e: eth0 NIC Link is Up 100 Mbps Half Duplex, Flow Control: None
[  318.134172] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO
[  400.763223] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx

[DeepDayze]

Best cable for ensuring you get reliable 1000Mbit network speeds are Cat 5e cables, where as the older cat 5 (with no e) just barely support that speed reliably. Also make sure you are using quality made cables and that are not damaged. Hope this helps.