[  523.578330] netdevsim netdevsim623 eni623np1: renamed from eth1
[  523.675139] netdevsim netdevsim401 eni401np1: renamed from eth0
[  523.914358] Could not find device with ifindex 2000 in netnsfd 11
[  523.914508] Could not find netns with fd: 2000
[  523.914581] Cannot link a netdevsim to itself
[  523.914667] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).