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2.2.4.26 SMB_COM_WRITE_MPX (0x1E)

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This command was introduced in the LAN Manager 1.0 dialect and is obsolescent. The command was redesigned for NT LAN Manager. This document describes only the NT LAN Manager behavior. See section 2.1.2.1 for more information.

SMB_COM_WRITE_MPX is used to maximize performance when writing a large block of data from the client to the server. This command is valid only when using a multiplexed session over a connectionless transport; see section 2.1.3. The TID, PID, UID, MID, and CID MUST be identical in all requests and responses in a given SMB_COM_WRITE_MPX exchange.

This command supports 32-bit file offsets only. Server support of this command is optional. If the server supports this command, it MUST set the CAP_MPX_MODE bit in the Capabilities field of the response to SMB Protocol negotiation.<35>