[ 1187.631835][T10980] Could not find device with ifindex 2000 in netnsfd 11
[ 1187.632643][T10980] Could not find netns with fd: 2000
[ 1187.633187][T10980] Cannot link a netdevsim to itself
[ 1187.634085][T10980] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).