[ 1200.037472][T10985] Could not find device with ifindex 2000 in netnsfd 11
[ 1200.038227][T10985] Could not find netns with fd: 2000
[ 1200.038842][T10985] Cannot link a netdevsim to itself
[ 1200.039528][T10985] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).