[  476.832138] netdevsim netdevsim421 eni421np1: renamed from eth0
[  476.832463] netdevsim netdevsim655 eni655np1: renamed from eth1
[  476.935040] Could not find device with ifindex 2000 in netnsfd 11
[  476.935122] Could not find netns with fd: 2000
[  476.935163] Cannot link a netdevsim to itself
[  476.935211] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).