dmesg trace bad net

[ 9237.909109] cgroup: libvirtd (1653) created nested cgroup for controller "memory" which has incomplete hierarchy support. Nested cgroups may change behavior in the future.
[ 9237.909113] cgroup: "memory" requires setting use_hierarchy to 1 on the root.
[ 9237.933187] device vnet1 entered promiscuous mode
[ 9237.940736] virbr1: port 2(vnet1) entered listening state
[ 9237.940766] virbr1: port 2(vnet1) entered listening state
[ 9239.944856] virbr1: port 2(vnet1) entered learning state
[ 9241.949382] virbr1: topology change detected, propagating
[ 9241.949398] virbr1: port 2(vnet1) entered forwarding state
[ 9241.949428] IPv6: ADDRCONF(NETDEV_CHANGE): virbr1: link becomes ready
[ 9414.611219] alx 0000:01:00.0 em1: Link Down
[ 9414.613421] vnet0: port 1(em1) entered disabled state
[ 9417.618309] alx 0000:01:00.0 em1: NIC Up: 1 Gbps Full
[ 9417.618946] vnet0: port 1(em1) entered listening state
[ 9417.618961] vnet0: port 1(em1) entered listening state
[ 9432.651384] vnet0: port 1(em1) entered learning state
[ 9435.500204] alx 0000:01:00.0 em1: Link Down
[ 9435.502485] vnet0: port 1(em1) entered disabled state
[ 9438.510809] alx 0000:01:00.0 em1: NIC Up: 1 Gbps Full
[ 9438.511389] vnet0: port 1(em1) entered listening state
[ 9438.511411] vnet0: port 1(em1) entered listening state
[ 9453.520865] vnet0: port 1(em1) entered learning state
[ 9463.059774] nfs: server synologynas not responding, timed out
[ 9468.564778] vnet0: topology change detected, propagating
[ 9468.564814] vnet0: port 1(em1) entered forwarding state