Linux Network Administrators Guide (2nd Edition)

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.

Andrew Anderson Thu Mar 7 23:22:06 EST 1996