Realtek r8169 always flapping

[Kseniya Blashchuk]

Tried setting just speed 1000 duplex full - no difference.
After that set speed 1000 duplex full on a switch side - link down O_o.
After changing to 100 everything is working.
Now set ETHTOOL_OPTS="autoneg off speed 100 duplex full" only on my side
(and auto on a switch - standard port config)
No flapping so far on 100Mbps. I think I will use this workaround, still
very strange why it doesn't work properly on 1000, I guess its a kernel
module problem or something like that. If anybody still has any suggestions
about 1Gbps - you are welcome :).

пн, 26 окт. 2015 г. в 21:47, Rick Stevens <ricks at alldigital.com>:

> On 10/26/2015 11:24 AM, Kseniya Blashchuk wrote:
> > 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.
>
> Not sure what's on the end of your dot1x, but it may be part of the
> autonegotiation process to make that all work. You can leave autoneg
> on to get by that, but still set the speeds and such once its done. That
> may get squonked (new word) by future negotiations. Dunno.
>
> > On Mon, Oct 26, 2015, 9:14 PM Rick Stevens <ricks at alldigital.com
> > <mailto: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
> >     <mailto:ricks at alldigital.com> -
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> ----------------------------------------------------------------------
> - Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
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