[  456.937598] netdevsim netdevsim300 eni300np1: renamed from eth0
[  456.938418] netdevsim netdevsim633 eni633np1: renamed from eth1
[  457.033076] Could not find device with ifindex 2000 in netnsfd 11
[  457.033224] Could not find netns with fd: 2000
[  457.033336] Cannot link a netdevsim to itself
[  457.033458] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).