[  490.325570] netdevsim netdevsim521 eni521np1: renamed from eth1
[  490.426294] netdevsim netdevsim489 eni489np1: renamed from eth0
[  490.759469] Could not find device with ifindex 2000 in netnsfd 11
[  490.759607] Could not find netns with fd: 2000
[  490.759692] Cannot link a netdevsim to itself
[  490.759790] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).