Does the network card stop seeing the switch in the entrance?

Question

Computer networks

In short, the leading card from the hypervisor to the provider fell off. The card is forwarded to a virtual machine with a gateway. Symptoms are the following. The traffic goes to the provider for some n-th amount of time and after that the access switch disappears from the visibility zone. Then a pause (different in time) and the switch returns to the visibility zone. Let's say 3 minutes of visibility and 4 minutes of downtime. The wire goes inside the house and is not exposed to outside. There is no way to change the card yet. Setevuhi while ordered, but!!!!!!!!!! which is the strangest thing. It was possible to achieve the work of the network card as follows. I put the switch on the ping (as a gateway to the provider's network) from an intranet machine. And while there is a ping 0_o, the connection is also kept. As soon as the ping killed ... with a short interval, the same pandemonium begins. Any ideas?

Answer 1

There are actually two ideas (wow - three):
1) The card goes to sleep - look at driver settings, OS and BIOS settings in terms of energy saving. In fact, the symptoms are very similar.
- how to check - connect directly to a computer / laptop
2) Crap cable and / or poorly crimped - re-crimp / change the cable here
- go to the switch and connect a computer / laptop instead, iperf will help measure the speed, measure for 600 seconds (10 min ), card statistics will show an
error
- see point 2), and then insert the cable into another port/network card.

Answer 2

Scan your computers for a virus, it looks like ARP-spoofing is disgusting or someone is naughty.
Remember the poppy of the gateway and after the disappearance again arp -a and check if the poppy at the gateway has changed.

Answer 3

Energy saving?
Try turning off power saving on your network card.