# Troubleshooting

## Common Issues

### LibreQoS Is Running, But Traffic Not Shaping

In ispConfig.py, make sure the edge and core interfaces correspond to correctly to the edge and core. Try swapping the interfaces to see if shaping starts to work.

Make sure your services are running properly

- `lqos.service`
- `lqos_node_manager`
- `lqos_scheduler`

Node manager and scheduler are dependent on the `lqos.service` being in a healthy, running state.

### RTNETLINK answers: Invalid argument

This tends to show up when the MQ qdisc cannot be added correctly to the NIC interface. This would suggest the NIC has insufficient RX/TX queues. Please make sure you are using the [recommended NICs](../SystemRequirements/Networking.md).