[  523.028904] netdevsim netdevsim521 eni521np1: renamed from eth1
[  523.126755] netdevsim netdevsim395 eni395np1: renamed from eth0
[  523.393895] Could not find device with ifindex 2000 in netnsfd 11
[  523.394114] Could not find netns with fd: 2000
[  523.394214] Cannot link a netdevsim to itself
[  523.394346] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).