I tried disabling autoneg, and it helped, but in this case dot1x auth doesn't work for some reason, I didn't have time to troubleshoot why, but there is no mac address on a switch port when dot1x is enabled.
But i didn't try setting speed 1000 duplex full on a switch side. I'll try it tomorrow once again.
On Mon, Oct 26, 2015, 9:14 PM Rick Stevens <ricks@xxxxxxxxxxxxxx> wrote:
On 10/26/2015 09:57 AM, Kseniya Blashchuk wrote:
> Hi everyone!
> I noticed in dmesg that my ethernet link is flapping all the time
> [Oct25 18:55] r8169 0000:02:00.0 enp2s0: link down
> [ +3.131667] r8169 0000:02:00.0 enp2s0: link up
> [Oct25 18:56] r8169 0000:02:00.0 enp2s0: link down
> [ +2.763688] r8169 0000:02:00.0 enp2s0: link up
> [Oct25 18:59] r8169 0000:02:00.0 enp2s0: link down
> [ +3.060069] r8169 0000:02:00.0 enp2s0: link up
> [Oct25 19:00] r8169 0000:02:00.0 enp2s0: link down
> [ +3.559610] r8169 0000:02:00.0 enp2s0: link up
> 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.
> My device in lspci:
> 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
Uhm, could be a kernel issue or a driver issue. Generally when I see
that sort of thing it's an auto speed or auto duplex negotiation between
the driver and switch that isn't working. You could try forcing the
speed and duplex via something like:
sudo ethtool -s enp2s0 autoneg off duplex full speed 1000
to set a fixed 1Gbps, full duplex connection and see if that helps
stabilize things. If that works you could try to restart auto
renegotiation via
sudo ethtool -s enp2s0 autoneg on
sudo ethtool -r enp2s0
The first comment re-enables autonegotiation, the second forces a
renegotiation.
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