[ 1196.017081][T10989] Could not find device with ifindex 2000 in netnsfd 11
[ 1196.017907][T10989] Could not find netns with fd: 2000
[ 1196.018465][T10989] Cannot link a netdevsim to itself
[ 1196.019148][T10989] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).