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pcap_talk's Introduction

Notes for Pcap 101

Why

  • Troubleshooting
    • Packets don't lie
    • Unless they do (host vs wire)
    • "The network is down..."
  • Security
    • Choke points
    • Impartial observation point
    • Encryption challenges
      • Metadata
      • Proxies
      • Pre/post encryption
  • Performance Monitoring
    • Packet loss
    • Latency
    • Jitter
    • Retransmits
    • Fragmentation

How

  • Simple host capture
    • Privilege level
  • Promiscuous mode
    • Why do we even have promiscuous mode?
  • What a switch sees
  • What a wifi adapter sees
  • Mirror ports
  • Taps

Tools

  • Tcpdump
  • Wireshark
  • Tshark
  • Tcpflow
  • Bro

Networking 001

  • Encapsulation
  • TCP vs UDP
  • Fragmentation vs Windowing vs Segmentation
  • Disambiguate terms
    • IP protocol field
    • L4 ports
    • Application layer protocol
  • Dissect a simple HTTP session running on localhost
  • Dissect a more complex HTTP session from real world

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Contributors

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