SCTP Packet Structure - Common Header

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.

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