Regardless of the Classical IP Interface Type, you must assign an IP address and hostname to the interface. For IPv4, if you enter a hostname that appears in the /etc/hosts file, or if NIS, NIS+, or DNS is enabled and the hostname is resolvable over it, you are not prompted to enter an IP address. Instead, the resolution is performed automatically. If the hostname cannot be resolved, you are prompted to enter an IP address. If you must enter an IP address, or if the address is only available through NIS, NIS+, or DNS, the SunATM software updates the /etc/hosts file. For IPv6, you must enter the hostname in the /etc/init/ipnodes file.
A valid IP hostname is no more than 80 characters. A valid IPv4 address is a set of four decimal numbers in the range of 0 to 255, separated by dots (for example, 149.144.130.9). A valid IPv6 address is . . . . .NEED INFO.