[  524.709125] netdevsim netdevsim520 eni520np1: renamed from eth1
[  524.805372] netdevsim netdevsim447 eni447np1: renamed from eth0
[  525.073969] Could not find device with ifindex 2000 in netnsfd 11
[  525.074174] Could not find netns with fd: 2000
[  525.074262] Cannot link a netdevsim to itself
[  525.074370] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).