[ 523.224938] netdevsim netdevsim451 eni451np1: renamed from eth0 [ 523.322582] netdevsim netdevsim532 eni532np1: renamed from eth1 [ 523.543769] Could not find device with ifindex 2000 in netnsfd 11 [ 523.543938] Could not find netns with fd: 2000 [ 523.544011] Cannot link a netdevsim to itself [ 523.544099] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).