TCP/IP Configuration and Management Manual

Configuration Reference
TCP/IP Configuration and Management Manual—427132-004
A-12
Domain Name Server Files
DNSCACHE
The DNSCACHE file primes the address of the root-domain name servers, basically
giving the domain name server a location to start searches.
An example of the DNSCACHE file is:
; Initial cache data for root domain servers.
;
. 99999999 IN NS SRI-NIC.ARPA.
99999999 IN NS NS.NASA.GOV.
99999999 IN NS TERP.UMD.EDU.
99999999 IN NS A.ISI.EDU.
99999999 IN NS BRL-AOS.ARPA.
99999999 IN NS GUNTER-ADAM.ARPA.
99999999 IN NS C.NYSER.NET.
; Prep the cache (hotwire the addresses).
SRI-NIC.ARPA. 99999999 IN A 10.0.0.51
SRI-NIC.ARPA. 99999999 IN A 26.0.0.73
NS.NASA.GOV. 99999999 IN A 128.102.16.10
A.ISI.EDU. 99999999 IN A 26.3.0.103
BRL-AOS.ARPA. 99999999 IN A 128.20.1.2
BRL-AOS.ARPA. 99999999 IN A 192.5.25.82
BRL-AOS.ARPA. 99999999 IN A 192.5.22.82
GUNTER-ADAM.ARPA. 99999999 IN A 26.1.0.13
C.NYSER.NET. 99999999 IN A 128.213.5.17
TERP.UMD.EDU. 99999999 IN A 10.1.0.17
In the example, the 99999999 is used as a very large number in the time-to-live field.
This number indicates that the data will be valid for 99999999 seconds (several years).
The example specifies seven known root domain name servers. These servers are to
be queried in order to resolve names.
The second part of the file specifies the Internet address of these domain name
servers. This specification is necessary so NAMED does not have to resolve the
address of these root-name servers.
DNSLOCAL
An example of the DNSLOCAL file is as follows:
@ IN SOA jiffy.kentcomm.com. joe.jiffy.kentcomm.com. (
1.1 ; Serial Number
3600 ; Refresh Time
300 ; Retry Time
3600000 ; Expire Time
3600 ) ; Minimum Time
IN NS pubs.kentcomm.com.
1 IN PTR local host.
In this example, a domain name server is on jiffy.kentcomm.com. The maintainer of this
database is joe.jiffy.kentcomm.com. The serial number of this database is 1.1. This
serial number must increment every time this file is altered.