# Configuring RADIUS-Based Mirroring

Packet mirroring enables you to send a copy of a packet to an external host for analysis. Packet mirroring has many uses, including traffic debugging and troubleshooting user networking problems.

This chapter contains the following sections:

- RADIUS-Based Mirroring Overview
- RADIUS Attributes Used for Packet Mirroring
- RADIUS-Based Packet Mirroring Dynamically Created Secure Policies
- RADIUS-Based Packet Mirroring MLPPP Sessions
- RADIUS-Based Mirroring Sequence of Events
- Configuring Router to Start Mirroring When User Logs On
- Configuring Router to Mirror Users Already Logged In