[ 1096.303685][T11107] Could not find device with ifindex 2000 in netnsfd 11
[ 1096.305412][T11107] Could not find netns with fd: 2000
[ 1096.306066][T11107] Cannot link a netdevsim to itself
[ 1096.306782][T11107] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).