[ 1114.161376][T11116] Could not find device with ifindex 2000 in netnsfd 11
[ 1114.162409][T11116] Could not find netns with fd: 2000
[ 1114.163558][T11116] Cannot link a netdevsim to itself
[ 1114.164711][T11116] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).