This repository is a job-ready walkthrough for mastering Wireshark through hands-on packet analysis.
The goal is simple: build practical, industry-relevant packet analysis skills that map directly to real security and network roles.
Wireshark is a free and open-source packet analyzer used for:
- Network troubleshooting
- Traffic analysis
- Protocol development and debugging
- Security investigations
- Learning how networks behave
It provides a graphical interface to capture and inspect packets in real time.
net_ctf.pcapng: sample capture file for practicewireshark_window.png: reference screenshot of the Wireshark interfacereadme.md: this guide
Download Wireshark from the official website:
Note: This guide was written on Windows. Some steps may look slightly different on Linux or macOS.
Wireshark helps you answer practical questions such as:
- Which hosts are communicating?
- Which protocols are most active?
- Are there suspicious or malformed packets?
- Why is an application connection failing?
The main window is split into these sections:
- Packet List Pane Shows all captured packets with summary fields such as time, source, destination, protocol, and length.
- Packet Details Pane Displays the protocol tree for the selected packet. Expand each layer to inspect fields.
- Packet Bytes Pane Shows raw packet bytes in hexadecimal and ASCII.
- Display Filter Bar
Lets you filter visible packets using expressions (for example,
http,ip.addr == 192.168.1.10,tcp.port == 443). - Toolbar Provides quick actions for starting/stopping capture, opening files, and exporting results.
- Status Bar Displays packet counts and filter statistics.
If you are new to the tool, this tutorial is a solid starting point:
Before you begin analysis, configure your workspace for speed and clarity:
- Create a custom profile
- Adjust pane layout to your preference
- Enable useful coloring rules
- Save common display filters
- Add custom columns (for example: source port, destination port, stream index)
- Open Wireshark.
- Select the correct network interface (usually Wi-Fi or Ethernet).
- Click Start to begin capture.
- Generate traffic (browse a site, run a ping, open an app).
- Click Stop when enough traffic is collected.
- Install the required capture drivers (Npcap on Windows is the common choice).
- Run with the required privileges when needed.
- Select the correct interface, capturing from the wrong one gives empty or irrelevant data.
- Enable promiscuous mode only when necessary.
- Choose an appropriate snapshot length (
snaplen) to avoid truncating important payload data. - Configure output rotation by size or time to prevent very large single capture files.
- Double-check all settings before starting long captures.
This project includes a practice capture file:
net_ctf.pcapng
Open it in Wireshark to follow along with analysis.
When opening a capture, start with quick reconnaissance:
-
Check total capture size and packet count from "Capture File Properties" window as showin in the image Menu > Statistics > Capture File Properties /capture_properties.png
-
Identify top protocols in use. Menu > Statistics > Protocol Hierarchy
-
Top Conversations (You can do this in Step 4 with more precision by filtering) Menu → Statistics → Conversations
-
Apply filters to dig up important, conversations, ports and protocols. Menu → Statistics → Conversations → IPv4 tab
Report:
Top 3 IPs by packet count Which one is 192.168.1.111? How many packets is it generating?
- Review conversation statistics to find the most important hosts and flows.
From there, you can pivot into protocol-specific investigation (HTTP, DNS, TLS, TCP streams, and so on).
By following this guide and practicing on the included .pcapng file, you will develop essential skills expected in professional network analysis workflows:
- Packet capture and capture hygiene
- Precision filtering and rapid data isolation
- Flow-based investigation and protocol-driven analysis
- Traffic triage approaches used in professional security and operations environments