[  515.950871] netdevsim netdevsim721 eni721np1: renamed from eth1
[  516.048591] netdevsim netdevsim312 eni312np1: renamed from eth0
[  516.250340] Could not find device with ifindex 2000 in netnsfd 11
[  516.250533] Could not find netns with fd: 2000
[  516.250621] Cannot link a netdevsim to itself
[  516.250750] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).