IUCV direct and routed connections

SUSE Linux Enterprise Server 15 SP4 z/VM guest

The NETIUCV device driver uses TCP/IP over z/VM® virtual communications.

The communication peer is a guest of the same z/VM or the z/VM control program. No subchannels are involved, see Figure 1.

Figure 1. Direct IUCV connection
This graphic shows a network interface that maps to an IUCV device and is connected to a communication peer within z/VM.

If your IUCV connection is to a router, the peer can be remote and connected through an external network, see Figure 2.

Figure 2. Routed IUCV connection
In this graphic the IUCV device is connected to a router or TCP/IP service machine which is connected to a network adapter and an external network.

The standard definitions in the z/VM TCP/IP configuration files apply.

For more information of the z/VM TCP/IP configuration see: z/VM: TCP/IP Planning and Customization, SC24-6331.