Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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9.3. The /etc/resolv.conf file

This file is another text file, used by the resolver a library that determines the IP address for a host name. Following is a sample /etc/resolv.conf file: 


           search openna.com
           nameserver 208.164.186.1
           nameserver 208.164.186.2

Note: Name servers are queried in the order they appear in the file primary, secondary.

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The /etc/sysconfig/network-scripts/ifcfg-ethN filesUpThe /etc/host.conf file