IBM z/OS Network Basics

To check the network configuration on a z/OS system, you can use various utilities and commands provided by the operating system. Below are some commonly used methods. 

TCP/IP Networking

For TCP/IP networking, you can check the configuration using the following methods:

TCP/IP Configuration Files

Locate the configuration files in the TCPIP.DATA dataset. Files like TCPIP.PROFILE, TCPIP.SYSLOG, and TCPIP.SERVLET contain configuration parameters for TCP/IP networking components such as TCP/IP stack configuration, DNS settings, routing tables, and more.

TCP/IP Commands

Use TCP/IP-related commands like NETSTAT, IFCONFIG, and ROUTE to display network interfaces, routing tables, and other network-related information. 

TCP/IP Configuration Panels

If you're using ISPF (Interactive System Productivity Facility), you can use the TCPIP Configuration panels (option 3.14 or similar) to view and modify TCP/IP configuration settings interactively.

Systems Network Architecture

For SNA (Systems Network Architecture), you can check the configuration using the following methods:

VTAM Commands

Use VTAM-related commands like DISPLAY NET and DISPLAY NODE to view network configuration settings, network nodes, and connections.

VTAM Configuration Panels

If you're using ISPF, you can use VTAM Configuration panels (option 5.4 or similar) to view and modify VTAM configuration settings interactively. To check the configuration of network hardware devices (such as network adapters or switches), you may need to use vendor-specific tools or commands provided by the hardware manufacturer. These tools typically allow you to view hardware status, configuration settings, and diagnostic information. Consider using network monitoring and management tools to gain insight into network performance, traffic, and configuration. These tools may provide graphical interfaces, dashboards, and reports for monitoring network health and diagnosing issues.

It's important to have appropriate permissions and authorization to access network configuration information on z/OS, especially for sensitive network settings.