[ 1242.120453][T11270] netdevsim netdevsim450 eni450np1: renamed from eth0 [ 1242.145946][T11268] netdevsim netdevsim515 eni515np1: renamed from eth1 [ 1245.445299][T11262] Could not find device with ifindex 2000 in netnsfd 11 [ 1245.446145][T11262] Could not find netns with fd: 2000 [ 1245.446856][T11262] Cannot link a netdevsim to itself [ 1245.447598][T11262] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).