[  472.555748] netdevsim netdevsim491 eni491np1: renamed from eth0
[  472.556571] netdevsim netdevsim521 eni521np1: renamed from eth0
[  472.633120] Could not find device with ifindex 2000 in netnsfd 11
[  472.633204] Could not find netns with fd: 2000
[  472.633246] Cannot link a netdevsim to itself
[  472.633292] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).