[ 521.356715] netdevsim netdevsim398 eni398np1: renamed from eth0 [ 521.453329] netdevsim netdevsim674 eni674np1: renamed from eth1 [ 521.693512] Could not find device with ifindex 2000 in netnsfd 11 [ 521.693679] Could not find netns with fd: 2000 [ 521.693769] Cannot link a netdevsim to itself [ 521.693875] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).