[ 486.136773] netdevsim netdevsim357 eni357np1: renamed from eth0 [ 486.238275] netdevsim netdevsim666 eni666np1: renamed from eth1 [ 486.606654] Could not find device with ifindex 2000 in netnsfd 11 [ 486.606802] Could not find netns with fd: 2000 [ 486.606884] Cannot link a netdevsim to itself [ 486.606991] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).