SCTP packet structure
List of chunk types
RFC 2960 defines the following list of chunk types. More detailed information about each type is provided in the following subsections.

SCTP packet structure

Section Title: List of chunk types
Table Section Text: RFC 2960 defines the following list of chunk types. More detailed information about each type is provided in the following subsections.

Value	Abbreviation	Description

0	DATA	Payload data

1	INIT	Initiation

2	INIT ACK	Initiation acknowledgement

3	SACK	Selective acknowledgement

4	HEARTBEAT	Heartbeat request

5	HEARTBEAT ACK	Heartbeat acknowledgement

6	ABORT	Abort

7	SHUTDOWN	Shutdown

8	SHUTDOWN ACK	Shutdown acknowledgement

9	ERROR	Operation error

10	COOKIE ECHO	State cookie

11	COOKIE ACK	Cookie acknowledgement

12	ECNE	Explicit congestion notification echo (reserved)

13	CWR	Congestion window reduced (reserved)

14	SHUTDOWN COMPLETE	Shutdown complete

15	AUTH	Authentication chunk

16-62	N/A	Reserved by IETF

63	IETF-defined chunk extensions

64	I-DATA	Payload data supporting packet interleaving

65-126	N/A	Reserved by IETF

127	IETF-defined chunk extensions

128	ASCONF-ACK	Address configuration change acknowledgement

129	N/A	Unassigned

130	RE-CONFIG	Stream reconfiguration

131	N/A	Unassigned

132	PAD	Packet padding

133-190	N/A	Reserved by IETF

191	IETF-defined chunk extensions

192	FORWARD-TSN	Increment expected TSN

193	ASCONF	Address configuration change

194	I-FORWARD-TSN	Increment expected TSN, supporting packet interleaving

195-254	N/A	Reserved by IETF

255	IETF-defined chunk extensions

Sentence(s)

Chunk type 132 is padding chunk (PAD).

final_sentence: Chunk type 132 is padding chunk (PAD).