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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 diagram to the right, 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 as well as different control messages. ==Common header == All SCTP packets require the common header section (shown with a blue background). ; Source port : This field identifies the sending port. ; Destination port : This field identifies the receiving port that hosts use to route the packet to the appropriate endpoint/application. ; Verification tag : A 32-bit random value created during initialization to distinguish stale packets from a previous connection. ; Checksum : SCTP's original design catered for Adler-32; but RFC 3309 changed the protocol to use the CRC32c algorithm. 〔. Castagnoli's et al. work on algorithmic selection of CRC polynomials〕〔 . Verification of Castagnoli's results by exhaustive search and some new good polynomials 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SCTP packet structure」の詳細全文を読む スポンサード リンク
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