[ 1115.705467][T11288] Could not find device with ifindex 2000 in netnsfd 11
[ 1115.706229][T11288] Could not find netns with fd: 2000
[ 1115.706807][T11288] Cannot link a netdevsim to itself
[ 1115.707490][T11288] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).