> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/hacking-wifi/wpa-wpa2-psk-network-attacks/packet-analysis/deauthentication-packet-analysis.md).
# Deauthentication Packet Analysis
Identify and interpret Wi-Fi deauthentication frames in an authorized capture.
### Overview
A deauthentication frame ends an existing 802.11 authentication relationship. An access point or client can send this management frame.
The frame includes a reason code. This code describes why the sender ended the relationship.
Analyze captures from networks you own or are authorized to assess.
### Filter deauthentication frames
Deauthentication frames use management-frame subtype `12`. Filter a saved capture with Tshark:
{% code overflow="wrap" %}
```bash
tshark -r CAPTURE-01.cap -Y "wlan.fc.type_subtype == 12" 2>/dev/null
```
{% endcode %}
### List destination MAC addresses
Extract the unique destination addresses from the matching frames:
{% code overflow="wrap" %}
```bash
tshark -r CAPTURE-01.cap -Y "wlan.fc.type_subtype == 12" -Tfields -e wlan.da 2>/dev/null | sort -u
```
{% endcode %}
### Inspect a specific client
Filter frames that contain a client MAC address:
{% code overflow="wrap" %}
```bash
tshark -r CAPTURE-01.cap -Y "wlan.fc.type_subtype == 12 && wlan.addr == AA:BB:CC:DD:EE:FF" 2>/dev/null
```
{% endcode %}
Replace `AA:BB:CC:DD:EE:FF` with the client MAC address from your authorized capture.
### Review packet fields
Use verbose output to inspect the frame details:
{% code overflow="wrap" %}
```bash
tshark -r CAPTURE-01.cap -Y "wlan.fc.type_subtype == 12" -V 2>/dev/null
```
{% endcode %}
Review these fields:
* **Source address** identifies the frame sender.
* **Destination address** identifies the affected client or broadcast destination.
* **BSSID** identifies the related access point.
* **Reason code** identifies the stated cause of the deauthentication.
### Interpret the results
A deauthentication frame confirms that a sender ended an 802.11 authentication relationship. It does not, by itself, establish the underlying cause.
Review the reason code, source address, and nearby frames. Correlate the event with disassociation, authentication, and association traffic for the same client.
---
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