Communications Server for z/OS V1R7 TCP/IP Implementation, Volume 1: Base Functions, Connectivity, and Routing

Chapter 3. Base functions 67

– NETSTAT commands

7. Have you placed the correct definitions in the z/OS data sets? For example:

SYSx.LNKLSTxx

SYSx.LPALSTxx

SYSx.SCHEDxx

SYSx.PROGxx

SYSx.IEASYSxx

SYSx.IEFSSNxx

SYSx.IKJTSOxx

SYSx.IVTPRMxx

8. Raw sockets require authorization; they run from SEZALOAD and are usually already

authorized; if you have moved applications and functions to another library (not

recommended), ensure that this library is authorized.

9. The loopback address is now 127.0.0.1 for IPv4 and ::1 for IPv6. However, If you require

14.0.0.0, have you added this to the HOME list?

10.Have you computed CSA requirements to include not only z/OS VTAM, but also CS for

z/OS IP?

– IEASYSxx: CSA(3000,250M) (need to review)

– IEASYSxx: SQA(8,448) (need to review)

11.Have you computed CSM requirements to include not only z/OS VTAM, but also CS for

z/OS IP?

– IVTPRMxx: FIXED MAX(120M)

– IVTPRMxx: ECSA MAX(30M)

12.Have you modified the CTRACE initialization member (CTIEZB00) to reflect 32 MB of

buffer storage?

13.Have you created CTRACE Writer procedures for taking traces?

14.Have you updated your TCP/IP procedure?

15.Have you updated your other procedures, for example, the FTP server procedure?

16.Have you revamped your TCP/IP Profile to use the new statements and to comment out

the old?

– Have you made provisions to address device connections that are no longer

supported?

– Have you investigated all your connections to ensure to what extent they are still

supported? (In some cases, definitions will have changed.)

17.Have your applications that relied on VMCF and IUCV sockets been converted now that

those APIs are no longer supported?

18.If you are migrating from a previous release, have you reviewed the Planning and

Migration checklist in z/OS V1R7.0 CS: IP Migration, GC31-8773, and made appropriate

plans to use the sample data sets?

19.Have you reviewed the list and location of configuration data set samples in z/OS V1R7.0

CS: IP Configuration Reference?

3.6 Configuring z/OS TCP/IP

A z/OS TCP/IP environment can be very complex. It is controlled using a large variety of

settings, including parmlib members, and /etc files for UNIX System Services. Each of which

68 Communications Server for z/OS V1R7 TCP/IP Implementation, Volume 1 - Base Functions, Connectivity, and Routing

has a different interface and requires special knowledge to configure. IBM has provided tools

to get you started and running with a very basic setup.

z/OS IP Configuration Tools

The z/OS IP Wizard and msys Setup are IBM offerings that may help you configure your z/OS

Communications Server for IP environment. Both may be used to generate configuration

files. We will use these tools to configure a single stack environment. However, since these

tools provide a very basic configuration, additional z/OS statements and commands will be

used to provide additions to the TCP/IP configuration.

z/OS IP Configuration Wizard

The z/OS IP Configuration Wizard sets up basic IP configuration for a single stack, including

options to include simple instances of OMPROUTE, FTP, and TN3270 servers if selected.

The wizard takes you through a series of screens where you enter information about your

z/OS IP configuration: General information such as the host name, the domain name, and the

IP address of a name server; information about the type of routing you will use, details about

your network connections, and whether you want to configure FTP and TN3270 servers and

use dynamic routing protocols. Wherever possible, the wizard uses defaults so they need to

be reviewed to ensure they fit your requirements. At the end of the exercise you can save and

transfer the output datasets to the z/OS system. We used the wizard and built a basic

customized PROFILE and TCPIP.DATA files, based on the information entered on the

screens. We then used cut and paste to create the customized files on the z/OS system. The

wizard also provides a checklist of tasks that must be completed when configuring z/OS IP.

The preparation and completion of the worksheet is recommended. It simplifies the process.

Here are examples of a few screens generated by the wizard and used in the configuration of

our single stack environment. The Wizard steps you through the entire configuration process

of a basic single stack.

Figure 3-5 indicates the various areas in which the wizard provides assistance for the

configuration of a basic single stack environment. You may save the completed process and

reload to update at a later date.

Figure 3-5 Wizard interview topics