[ 1023.292970][T12130] netdevsim netdevsim478 eni478np1: renamed from eth0 [ 1023.298184][T12069] netdevsim netdevsim711 eni711np1: renamed from eth1 [ 1025.124033][T12554] Could not find device with ifindex 2000 in netnsfd 11 [ 1025.125085][T12554] Could not find netns with fd: 2000 [ 1025.125873][T12554] Cannot link a netdevsim to itself [ 1025.126783][T12554] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).