[ 1022.539514][T12632] netdevsim netdevsim457 eni457np1: renamed from eth0 [ 1022.619932][T12581] netdevsim netdevsim712 eni712np1: renamed from eth1 [ 1024.497935][T12626] Could not find device with ifindex 2000 in netnsfd 11 [ 1024.498935][T12626] Could not find netns with fd: 2000 [ 1024.499620][T12626] Cannot link a netdevsim to itself [ 1024.500450][T12626] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).