[CentOS] E1000 eth1 link flakiness - causes??

Mon Dec 27 22:28:42 UTC 2010
fred smith <fredex at fcshome.stoneham.ma.us>

On Mon, Dec 27, 2010 at 05:22:38PM -0500, E Westphal wrote:
> Have  you experienced this? What's going on when this occurs? What do I
> need to do to keep it from occurring? Please advise. Thanks.

could be a bad network switch. or a bad cable on that NIC. 

Though I wouldn't expect a bad cable to happen with such uniform
periodicity (unless there's some physical disturbance that jiggles
the cable every 4-5 seconds trigging an intermittent connection.)

have you tried just walking around the back of that box and watching
the little blinky lights on the back to see if they go OFF every 4-5
seconds for a second or so then come back on? I'd expect either a bad
cable or switch to cause them to go off, if they really have disconnected.

> 
> Dec  4 10:18:17 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:19 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:18:21 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:23 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:18:24 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:25 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:18:26 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:28 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:18:29 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:31 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:18:37 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:39 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:18:42 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:18:43 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:19:07 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:19:08 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:19:13 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:19:14 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:19:17 localhost kernel: e1000: eth1 NIC Link is Down
> Dec  4 10:19:19 localhost kernel: e1000: eth1 NIC Link is Up 100 Mbps
> Full Duplex, Flow Control: RX/TX
> Dec  4 10:19:20 localhost kernel: e1000: eth1 NIC Link is Down


-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
                    The Lord detests the way of the wicked 
                  but he loves those who pursue righteousness.
----------------------------- Proverbs 15:9 (niv) -----------------------------