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. Overview of Wireshark, including Portable Wireshark and related resources.
5. Structure of the Wireshark GUI: Panes (Packet List, Details, Packet Bytes), Status Bar, etc.
6. Architecture and processing flow, including limitations on visibility.
7. Supported protocols and dissectors.
8. Preferences and configurations, both global and profile-specific.
9. Understanding time values.
10. Lab exercises.

Capturing Traffic

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

Traffic Analysis: Tools and Approaches

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

Traffic Analysis: Tools and Approaches (Continued)

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

Traffic Analysis: Protocols

1. Data-Link Layer: Ethernet II.
2. Network Layer: IPv4.
3. Transport Layer: TCP and UDP.
   1. Packet loss and recovery mechanisms.
   2. Events involving lost previous segments 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 and FTP.
5. Lab exercises and case studies.

Traffic Analysis: Common Issues in Network Performance Assessment

1. Root causes of performance problems.
2. Packet loss.
3. Bandwidth issues and a 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, and tcpdump
   2. editcap, mergecap, capinfos, and text2pcap.

Advanced Topics

1. Advanced filters and grouped iostats.
2. Summary and Q&A session.