[  491.033649] netdevsim netdevsim521 eni521np1: renamed from eth1
[  491.129057] netdevsim netdevsim502 eni502np1: renamed from eth0
[  491.401551] Could not find device with ifindex 2000 in netnsfd 11
[  491.401953] Could not find netns with fd: 2000
[  491.402063] Cannot link a netdevsim to itself
[  491.402190] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).