[ 1190.602065][T10970] Could not find device with ifindex 2000 in netnsfd 11
[ 1190.602772][T10970] Could not find netns with fd: 2000
[ 1190.603302][T10970] Cannot link a netdevsim to itself
[ 1190.603941][T10970] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).