Structure of Stream Control Transmission Protocol packets
Bits
Bits 0–7
8–15
16–23
24–31
+0
Source port
Destination port
32
Verification tag
64
Checksum
96
Chunk 1 type
Chunk 1 flags
Chunk 1 length
128
Chunk 1 data
...
...
...
Chunk N type
Chunk N flags
Chunk N length
...
Chunk N data
The Stream Control Transmission Protocol (SCTP) has a simpler basic packet structure than TCP. Each consists of two basic sections:
The common header, which occupies the first 12 bytes. In the adjacent diagram, this header is highlighted in blue.
The data chunks, which form the remaining portion of the packet. In the diagram, the first chunk is highlighted in green and the last of N chunks (Chunk N) is highlighted in red. There are several types, including payload data and different control messages.
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