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UDP (RFC 768)

Standards and protocols Web and networking protocols
Official docs Learn UDP (RFC 768) on your Mac

Official docs outline

6 sections
  1. UDP datagram format

    Source/destination ports, length and checksum in the 8-byte UDP header.

  2. Congestion control guidelines

    Why UDP applications must implement their own congestion control.

  3. Message size guidelines

    Avoiding IP fragmentation and choosing datagram sizes.

  4. Reliability guidelines

    What applications must add on top of UDP for reliable delivery.

  5. Checksum guidelines

    UDP checksum handling, including zero checksum considerations.

  6. Middlebox traversal

    NAT timeouts, keepalives and traversal behavior for UDP flows.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

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