[ 1204.192914][T11117] Could not find device with ifindex 2000 in netnsfd 11
[ 1204.193655][T11117] Could not find netns with fd: 2000
[ 1204.194228][T11117] Cannot link a netdevsim to itself
[ 1204.195206][T11117] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).