[ 522.994865] netdevsim netdevsim688 eni688np1: renamed from eth1 [ 523.092598] netdevsim netdevsim437 eni437np1: renamed from eth0 [ 523.312761] Could not find device with ifindex 2000 in netnsfd 11 [ 523.312947] Could not find netns with fd: 2000 [ 523.313025] Cannot link a netdevsim to itself [ 523.313111] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).