Each realm contains by default one predefined interface, and this interface uses the NSP protocol (i.e. socket protocol without encryption). Also by default, the interface is configured to be usable for inter-realm communication as well as for communication between realm and clients.

If you do not define any additional interfaces on the realm, all communication between the realm and other realms, and between the realm and clients, will use this interface. You can set up a cluster consisting of multiple realms, each of them having just this one default interface defined.

However, in general we recommend you to set up two NSP interfaces on each realm for non-encrypted communication, namely one interface for only inter-realm communication and one interface for only client communication to the realm. The options for setting up this configuration are available in the Enterprise Manager, under the Comms > Interfaces > Basic tab of each realm.

On the interface that you will use for inter-realm communication, use the following settings:

Similarly, on the interface that you will use for client communication with the realm, use the following settings:

After you make these changes, restart all of the realms, to ensure that the new interfaces are activated.

When you form the cluster, communication between realms in the cluster will use the NSP interface that you have configured for inter-realm communication.