[  520.452575] netdevsim netdevsim721 eni721np1: renamed from eth1
[  520.550534] netdevsim netdevsim398 eni398np1: renamed from eth0
[  520.773932] Could not find device with ifindex 2000 in netnsfd 11
[  520.774107] Could not find netns with fd: 2000
[  520.774200] Cannot link a netdevsim to itself
[  520.774288] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).