Network Packet Dictionary

Topics

Topic pages explain real-world network behavior as a story: what you see, why it happens, the packet flow, success vs failure patterns, and how to confirm it in Wireshark or tcpdump.

Each topic must link to at least one protocol page and one field page.

Topic Tabs

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How to use

1) Start from the symptom (timeout, retransmission, MTU issues).
2) Follow the packet flow checklist in the topic page.
3) Jump to protocol/field pages for exact details.

Every topic should include success vs failure patterns and a verification checklist.
TCP topics
DNS topics
  • DNS TimeoutsNo reply
  • NXDOMAIN vs SERVFAIL SoonErrors
  • DNS Cache Poisoning (Overview) SoonSecurity
IPv4 topics
  • Path MTU DiscoveryMTU
  • ICMP Fragmentation Needed SoonPMTUD
  • TTL Exceeded and Traceroute SoonRouting
Security topics
  • ARP SpoofingL2 attack
  • TLS SNI and Traffic Inspection SoonTLS
  • DNS Hijacking (Overview) SoonDNS
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