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The Question is: Is it possible to run LU6.2 (APPC) over TCP/IP? Currently we have an application which sends and receives data from an IBM host (CICS) via LU6.2 SNA connection. The application runs on a VAX in a DECNET environment and communicates to the IBM system via an SNA gateway. We would like to eliminate the gateway and run the application over a TCP/IP network. The IBM machine supports LU6.2 over TCP via the VTAM ANYNET product. Is there software available for the VAX/VMS environment which will allow us to do this (preferably without having to change the e xisting application code)? The Answer is : This function is defined by the MPTN (multi-protocol transport networking) architecture, and provided in the AnyNet/MVS product. The AnyNet product is not "SNA over TCP/IP", it provides a way of running the LU6.2 protocols (i.e. session/presentation services) over a TCP/IP transport network connection. If you want APPC over an IP network, then you need to run a higher layer protocol -- like LU6.2 -- on top of TCP, as TCP is simply a reliable byte-stream network transport. The BEA MessageQ, IBM MQ Series and related middleware products might be of interest here. The Compaq SNA APPC/LU6.2 Programming Interface for OpenVMS (V2.4 is current as of this writing; see SPD 26.88.xx) will be of particular interest.
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