- Launch the Wireshark app.
- Capture the traffic
- Go to Edit > Preferences
- Click to expand the Protocols tree
- Scroll down and select RADIUS
- Enter the RADIUS shared secret and click OK to save
- Enter "radius" in the display filter to display RADIUS traffic only
- Select the "Access-Request" packet to examine, and check the Attribute Value Pairs to find the decrypted username and password