[  472.631410] netdevsim netdevsim421 eni421np1: renamed from eth0
[  472.631740] netdevsim netdevsim515 eni515np1: renamed from eth1
[  472.700410] Could not find device with ifindex 2000 in netnsfd 11
[  472.700545] Could not find netns with fd: 2000
[  472.700648] Cannot link a netdevsim to itself
[  472.700759] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).