Packet Structure
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SCTP packets have a simpler basic structure than TCP packets. Each consists of two basic sections:
- The common header, which occupies the first 12 bytes and is highlighted in blue, and
- The data chunks, which occupy the remaining portion of the packet. The first chunk is highlighted in green, and the last of N chunks (Chunk N) is highlighted in red.
Each chunk has a type identifier that is one byte long yielding, at most, 255 different chunk types. RFC 4960 defines a list of chunk types and there are currently 15 types defined. The remainder of the chunk is a two byte length (maximum size of 65,535 bytes) and the data. If the chunk does not form a multiple of 4 bytes (i.e., the length is not a multiple of 4) then it is implicitly padded with zeros which are not included in the chunk length.
Read more about this topic: Stream Control Transmission Protocol
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