[  558.653254] netdevsim netdevsim521 eni521np1: renamed from eth1
[  558.754359] netdevsim netdevsim412 eni412np1: renamed from eth0
[  559.158509] Could not find device with ifindex 2000 in netnsfd 11
[  559.158660] Could not find netns with fd: 2000
[  559.158754] Cannot link a netdevsim to itself
[  559.158868] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).