<pre>[    3.083851] r8169 0000:04:00.0 enp4s0: renamed from eth0
[   21.738391] IPv6: ADDRCONF(NETDEV_UP): enp4s0: link is not ready
[   21.800717] r8169 0000:04:00.0 enp4s0: Link is Down
[   23.891908] r8169 0000:04:00.0 enp4s0: Link is Up - 1Gbps/Full - flow control rx/tx
[   23.891928] IPv6: ADDRCONF(NETDEV_CHANGE): enp4s0: link becomes ready
[  873.954243] r8169 0000:04:00.0 enp4s0: Link is Down
[  963.096930] r8169 0000:04:00.0 enp4s0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 1236.819360] r8169 0000:04:00.0 enp4s0: Link is Down
[ 1520.096289] r8169 0000:04:00.0 enp4s0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 2398.835494] r8169 0000:04:00.0 enp4s0: Link is Down
[ 2410.794950] r8169 0000:04:00.0 enp4s0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 2416.722326] r8169 0000:04:00.0 enp4s0: Link is Down
[ 2441.654496] r8169 0000:04:00.0 enp4s0: Link is Up - 1Gbps/Full - flow control rx/tx
</pre>