[ 1096.944326][T10980] Could not find device with ifindex 2000 in netnsfd 11
[ 1096.945151][T10980] Could not find netns with fd: 2000
[ 1096.945843][T10980] Cannot link a netdevsim to itself
[ 1096.946607][T10980] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).