The following lines were added (+) and removed (-):
192.168.1.3 first.domain.com first 192.168.1.3 alpha.domain.com alpha bravo 192.168.1.4 second.domain.com second 192.168.1.4 delta.domain.com delta 192.168.1.5 third.domain.com third 192.168.1.5 foxtrot.domain.com foxtrot If "ping alpha" or "ping bravo" is used, both will return 192.168.1.3 as will "ping alpha.domain.com". Another example from a CentOS system. 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 10.10.25.0 echo.foo.com echo 10.10.25.1 bravo.foo.com bravo The default Redhat format for the loopback interface is used.