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.
Read more about this topic: SCTP Packet Structure
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