Master Wireshark: Advanced Packet Filtering, Timing, and Analysis Techniques

1. Packet Filtering

Use display filters such as ip.addr==x.x.x.x to isolate traffic by IP, then combine with protocol (e.g., tcp) or port ( tcp.port==80). You can also filter by source and destination addresses ( ip.src==... and ip.dst==...) and by TCP sequence numbers to locate packet loss.

2. Changing Time Display Format

Adjust the time display via View → Time Display Format to show timestamps that are easier to read when diagnosing timing issues.

3. Verifying Packet Order

When relative sequence numbers (0, 1) are hard to read, switch to absolute sequence numbers via

Edit → Preferences → Protocols → TCP → Relative sequence numbers

. This allows sorting packets by their true order, useful for troubleshooting connections where source/destination IPs and ports are identical.

4. Saving Filtered Packets

After applying filters, export the resulting packet set to a separate capture file for later analysis.

5. Packet Count Statistics

Use the Statistics → Conversations view to count packets per flow, which helps identify flood attacks or unusually high traffic.

6. Decoding Packets

When logs from IPS and AV are mixed, decode the captured packets to separate the traffic and determine which packets correspond to which log source.

7. TCP Stream Tracing

Follow a TCP conversation to extract the full exchange, simplifying analysis of the interaction.

8. Identifying Device Manufacturer

Inspect the MAC address of a wireless interferer (e.g., A4-4E-31-30-0B-E0) and look it up in Wireshark’s manuf file to determine the vendor, aiding rapid location of the source.