[ 1196.066356][T10973] Could not find device with ifindex 2000 in netnsfd 11
[ 1196.067039][T10973] Could not find netns with fd: 2000
[ 1196.067620][T10973] Cannot link a netdevsim to itself
[ 1196.068319][T10973] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).