[ 1208.540494][T11125] Could not find device with ifindex 2000 in netnsfd 11
[ 1208.541207][T11125] Could not find netns with fd: 2000
[ 1208.541823][T11125] Cannot link a netdevsim to itself
[ 1208.542507][T11125] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).