Network Administration

Configuring for the OS/390 Environment

Under the OS/390 environment, the easiest way to configure your system is to give the configuration data sets the ETC high-level qualifier, for example, ETC.HOSTS and ETC.RESOLV.CONF. If you then do not set the TCPIP_PREFIX environment variable, and you do not apply the zap to the TCPIP_PREFIX in the transient library, your programs will always be able to find the configuration data sets. If you want to use the resolver for name resolution, you can create an ETC.RESOLV.CONF file.

An IBM TCP/IP site that prefers to use existing data sets can use the tcpip-prefix.TCPIP.DATA file to control name resolution.

An OS/390 site that does not use TCPIP as the high-level qualifier and that cannot use the ETC prefix will have to rely on environment variables (possibly DATASET_PREFIX in the TCPIP.DATA file) or the zap provided in the installation instructions. Environment variables work well if there is a way to set them, such as a CLIST that all TCP/IP users can run when they log on or before they run a client program. Also, using environment variables that have a permanent scope enables the user to set the variable once and then use the setting from that point onward. A site that cannot use the environment variables must rely on the zap provided in the installation instructions. Programs received from other sites may also require this zap.

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