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Chunk

Definition - What does Chunk mean?

Chunk is a control data (C/D) and packet set used in Stream Control Transmission Protocol (SCTP). SCTP packets are comprised of common headers and data chunks and vary by content.

Data chunks are defined in RFC 4960, which updates RFC 2960 and RFC 3309.

Techopedia explains Chunk

Chunk content types are defined as follows:

  • Chunk type: Predetermined eight-bit Internet Engineering Task Force (IETF) value defined by chunk field content
  • Chunk flags: Eight flag-bit value defined by chunk type with zero default
  • Chunk length: 16-bit unsigned value with no padding
  • Chunk value: General purpose value defined by chunk type.

The following are standard RFC 4960 chunk types:

  • DATA

  • INIT

  • INIT ACK

  • SACK

  • HEARTBEAT

  • HEARTBEAT ACK

  • ABORT

  • SHUTDOWN

  • SHUTDOWN ACK

  • ERROR

  • COOKIE ECHO

  • COOKIE ACK

  • ECNE

  • CWR

  • SHUTDOWN COMPLETE

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