Step 2: Customize z/OS Communications Server

To customize TCP/IP you need to update the cataloged procedures and configuration data sets for the TCP/IP address space, its clients, and servers.

z/OS® Communications Server runs as a started task in its own address space. Each of the servers runs in its own address space and is started with its own procedure. The TCP/IP address space requires:

A procedure in a system or recognized PROCLIB.
A data set that provides configuration definitions for the TCP/IP address space and includes statements affecting many of the servers. This data set is referred to as PROFILE.TCPIP.
A data set to provide the parameters that are common across all clients. This data set is referred to as TCPIP.DATA.

Other topics show you how to:

Configure the TCP/IP address space by updating the samples provided in SEZAINST(SAMPPROF) and SEZAINST(TCPIPROC).
Configure the universal client parameters provided in SEZAINST(TCPDATA).
Configure the site table, defined in hlq.HOSTS.LOCAL or hlq.ETC.IPNODES, to identify the Internet names and addresses of your TCP/IP host.
Customize the TCP/IP Component Trace parameters by updating the CTRACE parameter in the PARM= field of the EXEC JCL statement in the TCP/IP started procedure.
You can find a description of the MVS™ Component Trace support in the z/OS Communications Server: IP Diagnosis Guide.
Specify the ENVAR parameter on the PARM=keyword to override the resolver file. For more information on setting the environment variable RESOLVER_CONFIG using the ENVAR parameter, see Considerations for multiple instances of TCP/IP.
Configure each of the servers you want to run. This might require:
- Modifying sample procedures and adding them in your PROCLIB
- Modifying the configuration data set, PROFILE.TCPIP
- Adding port numbers to hlq.ETC.SERVICES
- Modifying other data sets containing server-specific parameters

You can find the sample procedures and data sets in SEZAINST. Table 1 provides additional reference information you can use as you configure and customize each server.

You can find general information about starting, stopping, and dynamically controlling the servers in z/OS Communications Server: IP System Administrator's Commands.

Many of the servers also require other data sets for their specific functions.