[  499.925157] netdevsim netdevsim621 eni621np1: renamed from eth1
[  500.023264] netdevsim netdevsim474 eni474np1: renamed from eth0
[  500.220735] Could not find device with ifindex 2000 in netnsfd 11
[  500.220874] Could not find netns with fd: 2000
[  500.220944] Cannot link a netdevsim to itself
[  500.221034] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).