Before implementing NJE/TCP, you need to set up TCP/IP on your MVS™ system. If you are already using TCP/IP for other applications, there are a few additional definitions required to enable JES2 to perform NJE/TCP. Your security administrator should determine the actual values to use. For more information, see z/OS Security Server RACF Security Administrator's Guide and z/OS UNIX System Services Planning. The additional definitions follow:

Check the buffer sizes defined in your TCP/IP definitions. In particular, you must set the TCPCONFIG MAXRECVBUFRSIZE and RECVBUFRSIZE parameters to at least 512, and ideally set them to a value of 32768 or higher.

The NJE/TCP implementation also supports virtual IP addresses (VIPA addresses), and the use of sysplex distributor to share IP addresses throughout a SYSPLEX. There is no additional JES2 setup to take advantage of either of these features other than to specify the appropriate IP address or host name on the SOCKET statement.

For more information, see z/OS Communications Server: IP Configuration Guide.