About
To configure the host to resolve host names to the loopback IP, the /etc/hosts file must be modified to contain the following entries:
127.0.0.1 hostname.domainname hostname
127.0.0.1 localhost.localdomain localhost
After doing so, you can check that the host name resolves to the loopback IP address by entering the following command:
/bin/ping hostname.domainname