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## Writing the Master Files

Figures-, , , and give sample files for a name server at the brewery, located on vlager. Owing to the nature of the network discussed (a single LAN), the example is pretty straightforward. If your requirements are more complex, and you can't get named going, get ``DNS and BIND'' by Cricket Liu and Paul Albitz ([]).

The named.ca cache file shown in figure- shows sample hint records for a root name server. A typical cache file usually describes about a dozen name servers, or so. You can obtain the current list of name servers for the root domain using the nslookup tool described toward the end of this chapter.

Figure: The named.ca file.

                    ;
                    ; /var/named/named.ca          Cache file for the brewery.
                    ;                We're not on the Internet, so we don't need
                    ;                any root servers. To activate these
                    ;                records, remove the semicolons.
                    ;
                    ; .                99999999   IN    NS  NS.NIC.DDN.MIL
                    ; NS.NIC.DDN.MIL   99999999   IN    A   26.3.0.103
                    ; .                99999999   IN    NS  NS.NASA.GOV
                    ; NS.NASA.GOV      99999999   IN    A   128.102.16.10

Figure: The named.hosts file.

                    ;
                    ; /var/named/named.hosts       Local hosts at the brewery
                    ;                               Origin is vbrew.com
                    ;
                    @                   IN  SOA   vlager.vbrew.com. (
                                                  janet.vbrew.com.
                                                  16         ; serial
                                                  86400      ; refresh: once per day
                                                  3600       ; retry:   one hour
                                                  3600000    ; expire:  42 days
                                                  604800     ; minimum: 1 week
                                                  )
                                        IN  NS    vlager.vbrew.com.
                    ;
                    ; local mail is distributed on vlager
                                        IN  MX    10 vlager
                    ;
                    ; loopback address
                    localhost.          IN  A     127.0.0.1
                    ; brewery Ethernet
                    vlager              IN  A     191.72.1.1
                    vlager-if1          IN  CNAME vlager
                    ; vlager is also news server
                    news                IN  CNAME vlager
                    vstout              IN  A     191.72.1.2
                    vale                IN  A     191.72.1.3
                    ; winery Ethernet
                    vlager-if2          IN  A     191.72.2.1
                    vbardolino          IN  A     191.72.2.2
                    vchianti            IN  A     191.72.2.3
                    vbeaujolais         IN  A     191.72.2.4

Figure: The named.local file.

                    ;
                    ; /var/named/named.local       Reverse mapping of 127.0.0
                    ;                               Origin is 0.0.127.in-addr.arpa.
                    ;
                    @                   IN  SOA   vlager.vbrew.com. (
                                                  joe.vbrew.com.
                                                  1          ; serial
                                                  360000     ; refresh: 100 hrs
                                                  3600       ; retry:   one hour
                                                  3600000    ; expire:  42 days
                                                  360000     ; minimum: 100 hrs
                                                  )
                                        IN  NS    vlager.vbrew.com.
                    1                   IN  PTR   localhost.

Figure: The named.rev file

                    ;
                    ; /var/named/named.rev         Reverse mapping of our IP addresses
                    ;                               Origin is 72.191.in-addr.arpa.
                    ;
                    @                   IN  SOA   vlager.vbrew.com. (
                                                  joe.vbrew.com.
                                                  16         ; serial
                                                  86400      ; refresh: once per day
                                                  3600       ; retry:   one hour
                                                  3600000    ; expire:  42 days
                                                  604800     ; minimum: 1 week
                                                  )
                                        IN  NS    vlager.vbrew.com.
                    ; brewery
                    1.1                 IN  PTR   vlager.vbrew.com.
                    2.1                 IN  PTR   vstout.vbrew.com.
                    3.1                 IN  PTR   vale.vbrew.com.
                    ; winery
                    1.2                 IN  PTR   vlager-if1.vbrew.com.
                    2.2                 IN  PTR   vbardolino.vbrew.com.
                    3.2                 IN  PTR   vchianti.vbrew.com.
                    4.2                 IN  PTR   vbeaujolais.vbrew.com.