[  520.796039] netdevsim netdevsim521 eni521np1: renamed from eth1
[  520.893914] netdevsim netdevsim323 eni323np1: renamed from eth0
[  521.111789] Could not find device with ifindex 2000 in netnsfd 11
[  521.112001] Could not find netns with fd: 2000
[  521.112105] Cannot link a netdevsim to itself
[  521.112235] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).