[  493.494378] netdevsim netdevsim521 eni521np1: renamed from eth1
[  493.589604] netdevsim netdevsim496 eni496np1: renamed from eth0
[  493.832803] Could not find device with ifindex 2000 in netnsfd 11
[  493.833172] Could not find netns with fd: 2000
[  493.833248] Cannot link a netdevsim to itself
[  493.833336] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).