[ 1227.582627][T11424] Could not find device with ifindex 2000 in netnsfd 11
[ 1227.583420][T11424] Could not find netns with fd: 2000
[ 1227.584067][T11424] Cannot link a netdevsim to itself
[ 1227.584762][T11424] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).