[ 1227.285474][T11114] Could not find device with ifindex 2000 in netnsfd 11
[ 1227.286222][T11114] Could not find netns with fd: 2000
[ 1227.287012][T11114] Cannot link a netdevsim to itself
[ 1227.288120][T11114] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).