TCP Urgent Data
Normal data sent on a TCP connection is data corresponding to the incoming and outgoing byte stream data. In some data-transfer situations, there must be a method of sending control data to interrupt a process or inform the Application Layer protocol of asynchronous events. This control data is known as out of band data—data that is not part of the TCP byte stream but is needed to control the data flow. Out of band data for TCP connections can be implemented in the following ways:
Use a separate TCP connection for the out of band data. The separate TCP connection sends control commands and status information without being combined on the data stream of the data connection. This is the method used by FTP. FTP uses a TCP connection ...
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