[  489.002747] netdevsim netdevsim456 eni456np1: renamed from eth0
[  489.100213] netdevsim netdevsim721 eni721np1: renamed from eth1
[  489.321658] Could not find device with ifindex 2000 in netnsfd 11
[  489.321998] Could not find netns with fd: 2000
[  489.322100] Cannot link a netdevsim to itself
[  489.322208] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).