Configuring and Managing MPE/iX Internet Services (MPE/iX 6.0)

Chapter 8 135
DNS BIND/iX
Data Files
; Root servers by address
A.ROOT-SERVERS.NET 99999999 IN A 198.41.0.4
B.ROOT-SERVERS.NET 99999999 IN A 128.9.0.107
C.ROOT-SERVERS.NET 99999999 IN A 192.33.4.12
D.ROOT-SERVERS.NET 99999999 IN A 128.8.10.90
E.ROOT-SERVERS.NET 99999999 IN A 192.203.230.10
F.ROOT-SERVERS.NET 99999999 IN A 192.5.5.241
G.ROOT-SERVERS.NET 99999999 IN A 192.112.36.4
H.ROOT-SERVERS.NET 99999999 IN A 128.63.2.53
I.ROOT-SERVERS.NET 99999999 IN A 192.36.148.17
Here, the dot (.) refers to the root domain and the 99999999 means a
very long time-to-live value. The TTL value is no longer used for
caching because the data isn’t discarded if it times out, but
administrators generally keep it around because it does no harm.
Your site may not have access to the Internet or may have protected its
connection via a firewall. Often in this type of DNS configuration, one
or more machines will be designated as a root server. In this case, the
cache file will contain a list of internal root servers, and not the official
Internet master root domain servers.
Testing Your Name Server
Perform simple checks on your name server’s health with nslookup.
This utility is standard with every TCP/IP-network-aware version of
UNIX. There are other similar tools available — see “List of Utilities”
later in this section for details.
You can find the source code for dig at several anonymous FTP archive
sites, including:
ftp://ftp.wonderland.org/NetBSD/NetBSD-current/src/usr.
sbin/named/dig/ for the NetBSD release. Use Archie to find other
sites.
The nslookup utility can be used interactively, much like other
programs, such as ftp. That is, if you invoke this program without
command line arguments, it displays a prompt and waits for your
command:
>server mpe3000
Default Name Server: mpe3000.cup.hp.com Address: 15.13.199.80
By default, nslookup performs queries based on host names you
submit; just enter a host name after the prompt:
> romeo
Server: mpe3000.cup.hp.com
Address: 15.13.199.80
Name: romeo.cup.hp.com
Address: 15.13.194.242
> 15.12.194.242
Server: mpe3000.cup.hp.com
Address: 15.13.199.80
Name: romeo.cup.hp.com
Address: 15.12.194.242