[  524.632346] netdevsim netdevsim621 eni621np1: renamed from eth1
[  524.729267] netdevsim netdevsim497 eni497np1: renamed from eth0
[  524.972834] Could not find device with ifindex 2000 in netnsfd 11
[  524.973084] Could not find netns with fd: 2000
[  524.973215] Cannot link a netdevsim to itself
[  524.973372] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).