Losing network connection

[dedi]

Since a few weeks (about since 6.6.0) I'm repeatedly loosing my network connection after a uptime from one to a few days. From that moment on I get "r8169 0000:0f:00.0 eth0: link up" spamed in the syslog.
I can manually put eth0 down and up with no success, also plugin in to another switch doesn't help. I can shut down eth0 and start using eth1, I currently have no bridging or bonding active. (A side note: isn't it strange that I can still connect to the IP of eth0 even it is down?).
The same thing happens when I switch eth0 with eth1.

Hardware:
Mainboard Z68 Professional Gen3, I2500k with 2 onboard NICs (r8169),
16 GB RAM
Unraid 6.6.2

 

dednas-diagnostics-20181019-1624.zip

[JorgeB]

There's a known issue with Realtek NICs and latest kernels, though it's supposed to be better on v6.6.2, for the future you might consider getting an addon Intel NIC.

[dedi]

Thank you for the answer. I could not find that myself. At least glad to hear it is already known.
Since I never had any other problems with these NICs I'll just wait for a fix or maybe downgrade in the meantime.

[JorgeB]

19 minutes ago, dedi said:

Since I never had any other problems with these NICs

There have been a lot in the past, hence why I suggested getting an Intel, since this is not the first time, but hopefully it will be fixed soon.

[dedi]

Thanks, I'll keep that in mind

I'm still curious, why can I connect to an IP that isn't up?
My config:
eth0: 192.168.0.20, after the problem I shut it down with (ifconfig eth0 down). eth1 takes over and network starts working again.
eth1: 192.168.0.21
On other devices on the network, I still can connect to 192.168.0.20