[ 1195.101206][T10984] Could not find device with ifindex 2000 in netnsfd 11
[ 1195.101938][T10984] Could not find netns with fd: 2000
[ 1195.102572][T10984] Cannot link a netdevsim to itself
[ 1195.103290][T10984] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).