The host name you select for the zone must be defined either in the hosts database or in the /etc/inet/hosts database, as specified by the /etc/nsswitch.conf file in the global zone. The network databases are files that provide network configuration information. The nsswitch.conf file specifies which naming service to use.
If you use local files for the naming service, the hosts database is maintained in the /etc/inet/hosts file. The host names for zone network interfaces are resolved from the local hosts database in /etc/inet/hosts. Alternatively, the IP address itself can be specified directly when configuring a zone so that no host name resolution is required.