[ 1197.054152][T10977] Could not find device with ifindex 2000 in netnsfd 11
[ 1197.054882][T10977] Could not find netns with fd: 2000
[ 1197.055456][T10977] Cannot link a netdevsim to itself
[ 1197.056159][T10977] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).