[  476.696452] netdevsim netdevsim521 eni521np1: renamed from eth1
[  476.696708] netdevsim netdevsim504 eni504np1: renamed from eth0
[  476.792290] Could not find device with ifindex 2000 in netnsfd 11
[  476.792380] Could not find netns with fd: 2000
[  476.792425] Cannot link a netdevsim to itself
[  476.792479] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).