[ 1024.092293][T12580] netdevsim netdevsim308 eni308np1: renamed from eth0 [ 1024.210760][T12581] netdevsim netdevsim735 eni735np1: renamed from eth1 [ 1026.023529][T12726] Could not find device with ifindex 2000 in netnsfd 11 [ 1026.025143][T12726] Could not find netns with fd: 2000 [ 1026.026275][T12726] Cannot link a netdevsim to itself [ 1026.027619][T12726] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).