Defining TCP/IP application configurations

Figure 1 illustrates the logical configuration of a network that simulates TCP/IP clients accessing a TCP/IP server. You would use this logical configuration to test client applications, to see how many clients your TCP/IP network can support, or to see the impact of many clients on your TCP/IP network.

Figure 1. TCP/IP network—logical configuration

A physical configuration that corresponds to this logical configuration is shown in Figure 2.

Figure 2. TCP/IP network—physical configuration

In this configuration, WSim runs as an application program of IBM® TCP/IP for MVS™. WSim uses the socket interface to send traffic to your TCP/IP network.

WSim does not drive any hardware directly when executing as a TCP/IP application. Instead, it uses the TCP/IP socket interface to send and receive messages, eliminating the need for any extra hardware resources. To run as a TCP/IP application program without a communication controller, WSim only requires a currently supported release of IBM TCP/IP. Refer to TCP⁄IP Planning and Customization for MVS for TCP/IP hardware requirements.