Defining IP interconnectivity (IPIC) connections

To define an IPIC connection, you create two resources, IPCONN and TCPIPSERVICE, on each CICS® region that you want to connect. You can either create new IPIC connections, or you can migrate your existing APPC connections.

1. Define a TCPIPSERVICE resource to receive inbound requests on the local CICS region.
   The name of the TCPIPSERVICE resource must match the value of the TCPIPSERVICE attribute for the IPCONN resource.
   1. Specify the IP address on which this CICS region will listen in the HOST attribute. The ANY option specifies that CICS listens on any of the addresses known to TCP/IP for the host system.
      The host name can be up to 116 characters in length, or can be an IPv4 or IPv6 address. If you use an IPv6 address, ensure that you are operating in a dual-mode environment and that the client or server that you are communicating with is also operating in a dual-mode environment.
   2. Specify a port number on which the local CICS region listens for incoming client requests in the PORT attribute.
   3. Specify IPIC for the PROTOCOL attribute.
   4. Specify NO for the SOCKETCLOSE attribute.
   5. Specify the 4-character ID of the CICS transaction that runs the DFHISCOP program as the value of the TRANSACTION attribute.
      The default transaction for IPIC is CISS.
   6. Leave the SPECIFTCPS attribute blank.
   7. Optional: Specify the name of the IPCONN autoinstall user program as the value of the URM attribute.
      If you do not specify this attribute, CICS uses the CICS-supplied default IPCONN autoinstall user program, DFHISAIP. Specify NO to disable autoinstall.
2. Create an IPCONN resource on the local CICS region.
   1. Specify the IPCONN name. Specify a 4-character IPCONN name with four trailing spaces for CICS-to-CICS communications.
   2. Specify the host name in the HOST attribute, using the value that is specified in the TCPIPSERVICE resource in the remote CICS region.
      For example, hostb.example.com
      The host name can be up to 116 characters in length, or can be an IPv4 or IPv6 address. If you specify an IPv6 address (or a host name that resolves to an IPv6 address), ensure that you are operating in a dual-mode (IPv4 and IPv6) environment and that the client or server that you are communicating with is also operating in a dual-mode (IPv4 and IPv6) environment.
   3. Specify in the PORT attribute the port number on which the remote CICS region will listen.
      Specify NO if this IPCONN resource is not used for outbound requests and you are using the CICS Transaction Gateway.
   4. Specify the name of the TCPIPSERVICE resource on the local CICS region that specifies the inbound attributes of the IPIC connection as the value for the TCPIPSERVICE attribute.
   5. Specify values for the APPLID and NETWORKID attributes if you want to connect to a remote system that is in a different network.
      The combination of APPLID and NETWORKID attributes ensures that the remote CICS region is referred to by a unique name.
   6. Optional: Specify YES or NO for the INSERVICE attribute to set if you want the connection to be available when the resource is created.
   7. Specify values for the RECEIVECOUNT and SENDCOUNT attributes to set how many receive and send sessions are allowed for the IPIC connection.
3. Create a TCPIPSERVICE resource in the remote CICS region.
4. Create an IPCONN resource in the remote CICS region.
   Specify AUTOCONNECT(YES) to establish the connection between the two CICS regions.