TCP/IP communication support concepts for DDM

Several concepts pertain specifically to the TCP/IP communications support used by DRDA^® and DDM.

• Establish a DRDA or DDM connection over TCP/IP
  To initiate a DDM server job that uses TCP/IP communications support, the DRDA application requester or DDM source system will connect to the well-known port number 446 or 447.
• DDM listener program
  The DDM listener allows client applications to establish TCP/IP connections with an associated server job by handling and routing inbound connection requests. After the client has established communications with the server job, there is no further association between the client and the listener for the duration of that connection.
• Start TCP/IP Server (STRTCPSVR) CL command
  The Start TCP/IP Server (STRTCPSVR) command, with a SERVER parameter value of *DDM or *ALL, is used to start the listener.
• End TCP/IP Server (ENDTCPSVR) CL command
  The End TCP/IP Server (ENDTCPSVR) command ends the DDM server.
• Start DDM listener in iSeries Navigator
  The DDM listener can also be administered using iSeries™ Navigator, which is part of iSeries™ Access Family.