Realtek r8169 always flapping

[Kseniya Blashchuk]

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 at alldigital.com> 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.
> ----------------------------------------------------------------------
> - Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
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