[  521.358405] netdevsim netdevsim621 eni621np1: renamed from eth1
[  521.456489] netdevsim netdevsim420 eni420np1: renamed from eth0
[  521.709178] Could not find device with ifindex 2000 in netnsfd 11
[  521.709388] Could not find netns with fd: 2000
[  521.709511] Cannot link a netdevsim to itself
[  521.709652] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).