[  520.413015] netdevsim netdevsim657 eni657np1: renamed from eth1
[  520.509872] netdevsim netdevsim321 eni321np1: renamed from eth0
[  520.730414] Could not find device with ifindex 2000 in netnsfd 11
[  520.730626] Could not find netns with fd: 2000
[  520.730738] Cannot link a netdevsim to itself
[  520.730878] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).