[ 1086.166043][T11105] Could not find device with ifindex 2000 in netnsfd 11
[ 1086.166815][T11105] Could not find netns with fd: 2000
[ 1086.167400][T11105] Cannot link a netdevsim to itself
[ 1086.168088][T11105] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).