Thanks everyone. I also think its a hardware issue, as a USB stick works well. 

чт, 29 окт. 2015 г. в 13:38, Tim <ignored_mailbox@yahoo.com.au>:
Allegedly, on or about 26 October 2015, Kseniya Blashchuk sent:
> I noticed in dmesg that my ethernet link is flapping all the time
> ..
> I changed the cabling, tried to plug into another switch no difference.
> Any ideas will be very appreciated as this flapping brings a lot of inconvenience.

I would strongly suspect the network card is broken.  Flapping is a
common effect seen in busted network cards.  I've even heard it said
that it's a deliberately designed failure indicator.

They do get busted easily enough, especially if you connect equipment
between different rooms, or buildings.  There can be quite a voltage
difference between the mains wiring, many cards don't have adequate
galvanic isolation, or none at all.  And long wiring can pick up EMI
from lightning storms.

--
[tim@localhost ~]$ uname -rsvp
Linux 3.9.10-100.fc17.x86_64 #1 SMP Sun Jul 14 01:31:27 UTC 2013 x86_64

All mail to my mailbox is automatically deleted, there is no point
trying to privately email me, I will only read messages posted to the
public lists.


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