[ 1020.653091][T12728] netdevsim netdevsim379 eni379np1: renamed from eth0 [ 1020.752864][T12679] netdevsim netdevsim721 eni721np1: renamed from eth1 [ 1022.491496][T12723] Could not find device with ifindex 2000 in netnsfd 11 [ 1022.492987][T12723] Could not find netns with fd: 2000 [ 1022.494067][T12723] Cannot link a netdevsim to itself [ 1022.495744][T12723] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).