Chunk Types
RFC 2960 defines the following list of chunk types.
Following this table each chunk and its parameters are defined. Please note the following color scheme:
- gray: chunk fields
- red: fixed parameters
- green/blue: optional/variable-length parameters that alternate colors
| 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 |
| 15-62 | N/A | Reserved by IETF |
| 63 | IETF-defined chunk extensions | |
| 64-126 | Reserved by IETF | |
| 127 | IETF-defined chunk extensions | |
| 128-190 | Reserved by IETF | |
| 191 | IETF-defined chunk extensions | |
| 192-254 | Reserved by IETF | |
| 255 | IETF-defined chunk extensions |
Read more about this topic: SCTP Packet Structure
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