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Protocol Analyzer

The Protocol Analyzer is a powerful tool designed to help network engineers and developers analyze network traffic, decode protocols, and troubleshoot network issues. With support for common packet capture formats and real-time visualization, it provides deep insights into your network communications.

Features​

1. Packet Capture Analysis​

  • Upload and analyze PCAP/PCAPNG files
  • View detailed packet information including timestamps, protocols, and payload data
  • Filter packets based on various criteria (protocol, address, content)

2. Protocol Decoding​

  • Automatic protocol detection and decoding
  • Support for common network protocols:
    • TCP/IP Suite (TCP, UDP, ICMP)
    • Application Layer (HTTP, HTTPS, DNS)
    • Network Services (DHCP, SNMP)
  • Detailed protocol field analysis and interpretation

3. Visual Flow Analysis​

  • Interactive packet flow visualization
  • Timeline-based packet sequence display
  • Host communication patterns
  • Protocol distribution statistics

4. Export Capabilities​

  • Export analysis results in multiple formats:
    • JSON for programmatic analysis
    • CSV for spreadsheet analysis
    • PCAP for sharing with other tools

Getting Started​

  1. Upload a Capture File

    • Click the "Upload PCAP File" button
    • Select a packet capture file from your system
    • The tool will automatically begin analysis

  2. Analyze Packets

    • View the packet list showing basic information
    • Click on any packet to see detailed protocol information
    • Use the filter bar to search for specific packets

  3. Visualize Flows

    • Enable advanced mode to see the packet flow visualization
    • Observe communication patterns between hosts
    • Analyze protocol distribution and statistics

  4. Export Results

    • Choose your preferred export format
    • Click the export button to download the analysis
    • Use the exported data with other analysis tools

Example Use Cases​

TCP Handshake Analysis​

Client (192.168.1.10) -> Server (192.168.1.20)
1. SYN
2. SYN-ACK
3. ACK

HTTP Request/Response​

Client -> Server: GET /index.html HTTP/1.1
Server -> Client: HTTP/1.1 200 OK

DNS Query Resolution​

Client -> DNS: Query (example.com)
DNS -> Client: Response (93.184.216.34)

Tips & Best Practices​

  1. Efficient Filtering

    • Use protocol names to focus on specific traffic types
    • Filter by IP address to track host communications
    • Combine filters for more precise analysis

  2. Performance Optimization

    • Split large capture files for better performance
    • Use specific time ranges when analyzing long captures
    • Export filtered results for detailed analysis

  3. Troubleshooting

    • Look for retransmissions in TCP connections
    • Check response times for application protocols
    • Analyze error packets and ICMP messages

Advanced Features​

Protocol Statistics​

The tool provides detailed statistics about your network traffic:

  • Packet counts by protocol
  • Bytes transferred
  • Time distribution
  • Host communication patterns

Custom Protocol Analysis​

For advanced users, the tool supports:

  • Custom protocol definitions
  • Header field extraction
  • Payload analysis rules