[  842.637780][T15857] netdevsim netdevsim390 eni390np1: renamed from eth0
[  842.653206][T15858] netdevsim netdevsim721 eni721np1: renamed from eth1
[  843.292923][T15843] Could not find device with ifindex 2000 in netnsfd 11
[  843.293581][T15843] Could not find netns with fd: 2000
[  843.294021][T15843] Cannot link a netdevsim to itself
[  843.294784][T15843] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).