Dictionary (Protocols by Layer)

Protocol pages explain each protocol as a whole: purpose, where it sits in the stack, a readable header overview, typical Wireshark appearance, and common troubleshooting patterns. This index is organized by OSI-like layers (L2/L3/L4/L7) so you can quickly jump from the capture you see to the right conceptual page. For precise meanings and values of a single header element (TTL, DF, SYN, Window, RCODE, SNI), use Fields. For real-world symptoms and step-by-step verification flows, use Topics.

In-progress entries are shown as “Soon” without links to prevent 404s. When a page becomes complete, you replace “Soon” with a link.