CentOS 7
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Configure Name Resolution
2014/07/10
 
Create zone files that servers resolve IP addresses from domain names.
[1] For internal zone,
This example uses internal address [10.0.0.0/24], domain name [srv.world], Replace them for your own environment.
[root@dlp ~]#
vi /var/named/srv.world.lan 
$TTL 86400
@   IN  SOA     dlp.srv.world. root.srv.world. (
        2014071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
# define name server

        IN  NS      dlp.srv.world.
# internal IP address of name server

        IN  A       10.0.0.30
# define Mail exchanger

        IN  MX 10   dlp.srv.world.
# define IP address and hostname

dlp     IN  A       10.0.0.30
[2] For external zone,
This example uses external address [172.16.0.80/29], domain name [srv.world], Replace them for your own environment.
[root@dlp ~]#
vi /var/named/srv.world.wan 
$TTL 86400
@   IN  SOA     dlp.srv.world. root.srv.world. (
        2014071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
# define name server

        IN  NS      dlp.srv.world.
# external IP address of name server

        IN  A       172.16.0.82
# define Mail exchanger

        IN  MX 10   dlp.srv.world.
# define IP address and hostname

dlp     IN  A       172.16.0.82
Configure Address Resolution
 
Create zone files that servers resolve domain names from IP address.
[3] For internal zone,
This example uses internal address [10.0.0.0/24], domain name [srv.world], Replace them for your own environment.
[root@dlp ~]#
vi /var/named/0.0.10.db 
$TTL 86400
@   IN  SOA     dlp.srv.world. root.srv.world. (
        2014071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
# define name server

        IN  NS      dlp.srv.world.
# define the range of this domain included

        IN  PTR     srv.world.
        IN  A       255.255.255.0
# define hostname of an IP address

30      IN  PTR     dlp.srv.world.
[4] For external zone,
This example uses external address [172.16.0.80/29], domain name [srv.world], Replace them for your own environment.
[root@dlp ~]#
vi /var/named/80.0.16.172.db 
$TTL 86400
@   IN  SOA     dlp.srv.world. root.srv.world. (
        2014071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
# define name server

        IN  NS      dlp.srv.world.
# define the range of this domain included

        IN  PTR     srv.world.
        IN  A       255.255.255.248
# define hostname of an IP address

82      IN  PTR     dlp.srv.world.
 
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