[ 1092.485924][T11110] Could not find device with ifindex 2000 in netnsfd 11
[ 1092.486622][T11110] Could not find netns with fd: 2000
[ 1092.487189][T11110] Cannot link a netdevsim to itself
[ 1092.488159][T11110] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).