[ 1205.154855][T10986] Could not find device with ifindex 2000 in netnsfd 11
[ 1205.155681][T10986] Could not find netns with fd: 2000
[ 1205.156253][T10986] Cannot link a netdevsim to itself
[ 1205.157213][T10986] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).