Enabling end-to-end communication between IPv4 and IPv6 applications

Figure 1 shows communication between IPv4 and IPv6 applications:

Figure 1. Communicating between IPv4 and IPv6 applications

A diagram that shows in a network, IPv4 and IPv6 applications need to communicate with each other.

z/OS® Communications Server can be an IPv4-only or dual-mode stack.

There is no support for an IPv6-only stack. By default, IPv6-enabled applications can communicate with both IPv4 and IPv6 peers. A socket option makes an IPv6-enabled application require all peers to be IPv6. See Socket option to control IPv4 and IPv6 communications for detailed information about the IPV6_V6ONLY socket option.