[ 1209.077769][T11116] Could not find device with ifindex 2000 in netnsfd 11
[ 1209.078520][T11116] Could not find netns with fd: 2000
[ 1209.079110][T11116] Cannot link a netdevsim to itself
[ 1209.079859][T11116] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).