[ 1099.866040][T10967] Could not find device with ifindex 2000 in netnsfd 11
[ 1099.866840][T10967] Could not find netns with fd: 2000
[ 1099.867411][T10967] Cannot link a netdevsim to itself
[ 1099.868117][T10967] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).