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The z/OS TCP/IP stack is used as a forwarder to and from zCX for access to the external TCP/IP network. Access to the external network is implemented through the z/OS TCP/IP stack. You might want to restrict access in your installation to and from the zCX instances. Therefore, your networking team might establish z/OS IP filters to prevent unauthorized network traffic. 

The red arrow in Figure 2-12 on page 36 shows you the z/OS TCP/IP address, which is configured for the z/OS system itself. 

