[  487.602314] netdevsim netdevsim638 eni638np1: renamed from eth1
[  487.700614] netdevsim netdevsim321 eni321np1: renamed from eth0
[  487.930275] Could not find device with ifindex 2000 in netnsfd 11
[  487.930457] Could not find netns with fd: 2000
[  487.930534] Cannot link a netdevsim to itself
[  487.930624] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).