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The protocol used by SAP programs that communicate using the NI interface is called the SAP Protocol. This is an enhanced version of the TCP/IP protocol, which has been supplemented by one length field and some options for error information .


When defining the route permission table, you can use S as the initial letter. This then only allows the SAP protocol, that is, the line is interpreted as usual, but only SAP programs (SAP GUI, SAP application servers, etc.) are permitted to communicate with each other.

For more information, see: Creating a Route Permission Table


The NI network interface provides the SAP protocol as the default for communication, although it can also use the TCP/IP protocol with external programs (for example, telnet or lpd) that do not 'speak' SAP protocol.