Sequenced packet exchange
Sequenced Packet Exchange (SPX) is the OSI-model Transport layer protocol in the IPX/SPX protocol stack. It is a reliable, connection-oriented protocol, similar to the TCP protocol of the TCP/IP, but it is datagram rather than stream protocol.
SPX packet structure
Each SPX packet begins with a header with the following structure:
|2||Source Connection Id|
|2||Destination Connection Id (0xFFFF = unknown)|
|2||Allocation Number (The number of outstanding receive buffers available)|
The Connection Control fields contains 4 single-bit flags:
The Datastream Type serves to close the SPX connection. For this purpose two values are used:
|0x00-0xFD||Available for client use|
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