[ 1097.992854][T11095] Could not find device with ifindex 2000 in netnsfd 11
[ 1097.993542][T11095] Could not find netns with fd: 2000
[ 1097.994071][T11095] Cannot link a netdevsim to itself
[ 1097.994743][T11095] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).