[  485.481379] netdevsim netdevsim521 eni521np1: renamed from eth1
[  485.481520] netdevsim netdevsim434 eni434np1: renamed from eth0
[  485.575916] Could not find device with ifindex 2000 in netnsfd 11
[  485.576002] Could not find netns with fd: 2000
[  485.576047] Cannot link a netdevsim to itself
[  485.576097] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).