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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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## Multihomed Hosts

The term multihomed host describes a host that is located on more than one public network. Such a host has multiple host names and IP addresses. It has one host name–IP address pair for each network. Oracle Solaris Cluster is designed to permit a host to appear on any number of networks, including just one (the non-multihomed case). Just as the physical host name has multiple host name–IP address pairs, each resource group can have multiple host name–IP address pairs, one for each public network. When Oracle Solaris Cluster moves a resource group from one physical host to another physical host, the complete set of host name–IP address pairs for that resource group is moved.

The set of host name–IP address pairs for a resource group is configured as logical host name resources contained in the resource group. These network address resources are specified by the cluster administrator when the resource group is created and configured. The Oracle Solaris Cluster Data Service API contains facilities for querying these host name–IP address pairs.

Most off-the-shelf data service daemons that have been written for the Oracle Solaris Operating System already handle multihomed hosts correctly. Many data services do all their network communication by binding to the Oracle Solaris wildcard address `INADDR_ANY`. This binding automatically causes the data services to handle all the IP addresses for all the network interfaces. `INADDR_ANY` effectively binds to all IP addresses that are currently configured on the machine. A data service daemon that uses `INADDR_ANY` generally does not need to be changed to handle the Oracle Solaris Cluster logical network addresses.

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