[ 1116.600527][T11114] Could not find device with ifindex 2000 in netnsfd 11
[ 1116.601561][T11114] Could not find netns with fd: 2000
[ 1116.602400][T11114] Cannot link a netdevsim to itself
[ 1116.603748][T11114] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).