When you run the Oracle Solaris installation program on a system, the program configures the initial /etc/inet/hosts file. This file contains the minimum entries that the local host requires. The entries include the loopback address, the host IPv4 address, and the host name.
For example, the Oracle Solaris installation program might create the following /etc/inet/hosts file for system tenere shown in Figure 5–1:
127.0.0.1 localhost loghost #loopback address 192.168.200.3 tenere #host name
In Example 10–1, the IPv4 address 127.0.0.1 is the loopback address. The loopback address is the reserved network interface that is used by the local system to allow interprocess communication. This address enables the host to send packets to itself. The ifconfig command uses the loopback address for configuration and testing, as explained in Monitoring the Interface Configuration With the ifconfig Command. Every system on a TCP/IP network must use the IP address 127.0.0.1 for IPv4 loopback on the local host.
Some systems have more than one network interface, because they are either routers or multihomed hosts. Each network interface that is attached to the system requires its own IP address and associated name. During installation, you must configure the primary network interface. If a particular system has multiple interfaces at installation time, the Oracle Solaris installation program also prompts you about these additional interfaces. You can optionally configure one or more additional interfaces at this time, or manually, at a later date.
After the Oracle Solaris installation, you can configure additional interfaces for a router or multihomed host by adding interface information to the systems' /etc/inet/hosts file. For more information on configuring routers and multihomed hosts refer to Configuring an IPv4 Router and Configuring Multihomed Hosts.
127.0.0.1 localhost loghost 192.168.200.70 timbuktu #This is the local host name 192.168.201.10 timbuktu-201 #Interface to network 192.9.201