[  523.719993] netdevsim netdevsim640 eni640np1: renamed from eth1
[  523.816817] netdevsim netdevsim420 eni420np1: renamed from eth0
[  524.074396] Could not find device with ifindex 2000 in netnsfd 11
[  524.074591] Could not find netns with fd: 2000
[  524.074672] Cannot link a netdevsim to itself
[  524.074760] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).