https://docs.oracle.com/en/operating-systems/oracle-linux/6/admin/about-etc-named.html
13.3.1 About the /etc/named.conf File
about the etcnamedconffile
https://docs.oracle.com/en/operating-systems/oracle-linux/6/admin/about-etc-sysconfig.html
11.2.4 About the /etc/sysconfig/network File
about the etcnetworkfile