> For the complete documentation index, see [llms.txt](https://docs.monogoto.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.monogoto.io/hub/captures/basics-on-how-to-read-a-packet-capture-file.md).

# Basics on How to Read a Packet Capture File

1. The [Monogoto hub](https://hub.monogoto.io) allows you to enable a packet capture of the user-plane data from your device. This feature must be manually enabled—please refer to this [document ](https://docs.monogoto.io/hub/captures)for instructions on how to activate the capture and this [document ](https://docs.monogoto.io/hub/faq/how-to-create-a-capture-pcap-file-for-a-sim)to download the PCAP.
2. Packet captures are a valuable troubleshooting tool when your device is connected to the cellular network but not communicating with your server.
3. To analyze the packet capture, you will need to download Wireshark, a widely used network protocol analyzer. Wireshark allows you to inspect network traffic, analyze communication patterns, and diagnose connectivity issues. You can download it from[ Wireshark’s official website](https://www.wireshark.org/).
4. When you open the packet capture in Wireshark, you will see key details such as:

* Packet number
* Timestamp
* Source IP address (device IP)
* Destination IP address (server IP)
* Protocols in use (e.g., TCP, UDP, HTTP, MQTT)
* Packet size 
* Detailed communication logs

<figure><img src="/files/TXSr9i7Cnxw5bzz6qy44" alt=""><figcaption></figcaption></figure>

5. Each Monogoto SIM has a private IP address starting with 10.xxx.xxx.xxx. You can find this on the Things page in the [Monogoto hub](https://hub.monogoto.io).

<figure><img src="/files/X69VMAMc1GgRKafXGxP0" alt=""><figcaption></figcaption></figure>

6. To troubleshoot connectivity, it’s important to:

* Identify the IP address of your server
* Confirm the protocols used by your IoT application

7. With the packet capture, you can verify if two-way communication between your device and server is successful. For a reference on common IoT communication protocols, please see document.
8. In the screenshot below, you can see successful two-way TCP communication between the Monogoto SIM’s private IP (10.xxx.xxx.xxx) and the server (3.120.xxx.xxx).

<figure><img src="/files/0w4n0VPNCFoenSz4nmeo" alt=""><figcaption></figcaption></figure>

9. If you need help interpreting the packet capture, please reach out to the Monogoto Support team, and we will be happy to assist.&#x20;

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