Basics on How to Read a Packet Capture File

1. The Monogoto hub 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 for instructions on how to activate the capture and this document 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.

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

1. 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.

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

• Identify the IP address of your server

• Confirm the protocols used by your IoT application

1. 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.

2. 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).

1. If you need help interpreting the packet capture, please reach out to the Monogoto Support team, and we will be happy to assist.