[ 1228.324840][T11115] Could not find device with ifindex 2000 in netnsfd 11
[ 1228.325541][T11115] Could not find netns with fd: 2000
[ 1228.326123][T11115] Cannot link a netdevsim to itself
[ 1228.332629][T11115] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).