[  518.906131] netdevsim netdevsim520 eni520np1: renamed from eth1
[  519.003488] netdevsim netdevsim301 eni301np1: renamed from eth0
[  519.241838] Could not find device with ifindex 2000 in netnsfd 11
[  519.242017] Could not find netns with fd: 2000
[  519.242094] Cannot link a netdevsim to itself
[  519.242189] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).