Configuring Domain Name System (DNS) Characteristics
7-14 TCP/IP Network Characteristics
A local name server is any name server that is authoritative for the default domain of
the access server. Before adding a local name server, you must first define the access
server domain name. The following example shows how to enter a local Internet name
server:
Local> CHANGE INTERNET NAMESERV NAMED.ACME.COM ADDRESS
99.99.99.99 LOCAL
You can use a relative domain name if you are defining a local name server for the
default domain only.
Configuring a Name Server for a Different Domain
To enter a locally defined name server for a domain other than the access server default
domain, follow these steps:
Name Resolution and Gateways
The access server uses the learned name servers to perform name resolution when
using REMOTE or ORDERED name resolution modes. The list of learned name
servers for a given domain are, in general, a superset of those explicitly entered with
the CHANGE INTERNET NAMESERVER command. The access server primes the
cache for the server’s default domain by sending queries to the configured name
servers. The queries request the names of all authoritative name servers for the default
domain.
The access server may not be able to reach a learned name server because of subnet
access restrictions on the access server itself. In this case, the access server flags the
unreachable name server and stops using it for name resolution. The access server
cannot reach a name server if it is not in the same subnet or there is no gateway to it.
Step Action
1 Use the SET INTERNET NAME RESOLUTION DOMAIN command
to change the access server default domain name temporarily.
Note:
Temporarily changing the default name affects the ability of other users
in resolving relative domain names.
2 Use the SET/DEFINE/CHANGE INTERNET NAMESERVER
domain-name
ADDRESS
n.n.n.n
LOCAL command to add the name
server.
3 Change the access server default domain name back to the original
domain name.
