[  513.321563] netdevsim netdevsim521 eni521np1: renamed from eth1
[  513.417951] netdevsim netdevsim333 eni333np1: renamed from eth0
[  513.619442] Could not find device with ifindex 2000 in netnsfd 11
[  513.619630] Could not find netns with fd: 2000
[  513.619733] Cannot link a netdevsim to itself
[  513.619840] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).