[ 1231.678384][T11144] netdevsim netdevsim505 eni505np1: renamed from eth0 [ 1231.711855][T11145] netdevsim netdevsim548 eni548np1: renamed from eth1 [ 1234.934105][T11136] Could not find device with ifindex 2000 in netnsfd 11 [ 1234.934868][T11136] Could not find netns with fd: 2000 [ 1234.935461][T11136] Cannot link a netdevsim to itself [ 1234.936101][T11136] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).