![]() ![]() ![]() IP_address canonical_hostname įields of the entry are separated by any whitespace (spaces or tabs). The order these resources are searched depends on the hosts: entry in the /etc/nf file. Host names and their IP addresses may be found in a variety of places: local files, remote DNS servers, or NIS+ servers, to name a few. Programs that need to lookup the numeric IP address for a name issue calls to this library. On a Linux system, these readable names are converted to their numeric IP equivalents by the Resolver Library, contained in the libresolve.so files provided as part of the glibc RPM package. The Domain Name Service (DNS) provides a mechanism to associate one or more alphanumeric names with a numeric IP address. Computers require these addresses but humans find remembering numeric values difficult. The IP address is traditionally written as where each xxx represents a value from 0 to 255, for an IPv4 network address. In order to send network traffic to a host, the numeric Internet Protocol (IP) address for that host must be known.
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