Sun Microsystems 3U manual Hostname and IP Address, Local ATM Address

Hostname and IP Address

Regardless of the Classical IP interface type, you must assign an IP address and hostname to the interface. 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 available only through NIS, NIS+, or DNS, the SunATM software updates the /etc/hosts file.

A valid IP hostname is no more than 80 characters. A valid IP address is a set of four decimal numbers in the range of 0 to 255, separated by dots (for example, 149.144.130.9).

Local ATM Address

The local ATM address is the 20-byte ATM address associated with a specific Classical IP instance. You must assign an ATM address to each Classical IP client and server, but you do not need to assign an ATM address on standalone (back-to- back) configurations. The following section describes ATM address formats and some of the SunATM software defined address variables.

ATM Address Formats and Variables

ATM addresses, like Network Service Access Point (NSAP) addresses, are 20 octets long, with each octet made up of 1 or 2 hexadecimal digits. The ATM address is divided into three fields: the End System Identifier field, the Selector field, and the Network Prefix field. The End System Identifier (ESI) field is a unique six-octet value, which can be the IEEE hardware MAC address conventionally associated with every network interface. The Selector field is one octet long. The 13 octets that make up the rest of the ATM address are called the Network Prefix. This field should be derived from the ATM switch fabric to which the interface is connected. Every ATM switch fabric is configured with a 13-octet prefix.

34 SunATM 3U CompactPCI Adapter Installation and User’s Guide • February 2001