TCP/IP Network Traffic Analysis with Wireshark Training Course

Network analysis overview

1. Essentials of the OSI reference model and TCP/IP networks.
2. Troubleshooting tools and methodologies.
3. Introduction to Wireshark
4. What is Wireshark? Portable Wireshark. Resources.
5. Wireshark GUI structure: Panes (Packet List, Details, Packet Bytes), Status Bar, etc.
6. Architecture and processing flow. Limitations: What cannot be seen with Wireshark?
7. Supported protocols and dissectors.
8. Preferences and configurations; global vs. profile-specific settings.
9. Understanding time values.
10. Lab exercises.

Capture traffic

1. Considerations before starting.
2. Promiscuous mode.
3. Capture filters.
4. Automatic stop criteria.
5. Remote capture.
6. Lab exercises.

Traffic analysis: tools and approaches

1. Analysis checklist.
2. Utilizing features: name resolution, colorization, marking, ignoring, commenting, time references, time shifts, etc.
3. Understanding the Expert System.
4. Accessing options via Right-Click functionality.
5. Interpretation (reference patterns) and the impact of OS/driver Offload features.
6. Saving results.
7. Lab exercises and case studies.

Traffic analysis: tools and approaches (cont.)

1. Filtering traffic: Display filters (preparing "in-flight" filters, macros), following streams.
2. Quantitative analysis.
   1. Basic predefined descriptive statistics and summaries: Capture Properties, Protocol Hierarchy, Conversations, Endpoints, Packet Lengths, IP-specific data.
   2. Protocol-specific analysis (e.g., TCP Stream Graphs).
   3. Advanced custom statistics using I/O Graph.
   4. Flow visualization.

Traffic analysis: protocols

1. Data-Link Layer: Ethernet II.
2. Network Layer: IPv4.
3. Transport Layer: TCP, UDP.
   1. Packet loss and recovery mechanisms.
   2. Events involving previous segment loss and Out-of-Order Segments.
   3. Duplicate ACKs and Fast Retransmissions.
   4. TCP Retransmissions.
   5. Zero Window, window changes, and other window-related issues.
4. Application layer: HTTP, FTP.
5. Lab exercises and case studies.

Traffic analysis: common issues in network performance assessment

1. Causes of performance problems.
2. Packet loss.
3. Bandwidth issues. Layered approach to measurement.
4. Latency: assessing end-to-end latency and visualization.
5. Lab exercises.
6. (Wireshark) command-line tools:
   1. tshark (terminal-based Wireshark), dumpcap, rawshark, tcpdump
   2. editcap, mergecap, capinfos, text2pcap.

Advanced topics

1. Advanced filters and grouped I/O statistics.
2. Summary and Q&A.