Note: Although it is possible to run iPrism without specifying a name server, it is
not advised. Many of iPrism features such as the anti-spoofing filter depending
on being able to contact a name server and will not work if no DNS server is
available.
If you want to modify the built-in name server, double-click the existing name server in the list and
type a new IP address. Click OK when you are done.
If the specified name server is not available, the iPrism will attempt to resolve the name through a
root name server if the DNS fallback to root option is checked.
Note: When using a forwarder, it is highly desirable to use the same DNS server
as used by the workstations. In this way, the DNS information will be cached
when iPrism asks for it, reducing the latency of the request.
11.
To use iPrism as a standalone DNS server, it must be able to issue DNS queries to the Internet.
This requires that iPrism be able to access the Internet for the DNS protocol. In this case, the
Forwarder field should be left empty.
Note: Although iPrism ships with an internal DNS server, it is always preferable
(i.e., faster) to use a name server instead.
It is possible to configure iPrism to use up to three parent servers, to ensure that iPrism will
always be able to resolve host names to IP addresses (and vice versa), even if the primary par-
ent server is not available.
To specify multiple parent servers, enter their IP addresses, separated by a comma, in the For-
warder field. Enter the IP addresses in the order that you want them to be accessed. For exam-
ple:
192.168.0.1,192.168.0.2,192.168.0.3
Note: In forwarding mode, iPrism is at the mercy of its parent name server. If the
parent server fails (the first server in this list), iPrism will not be able to resolve
names and consequently, not operate effectively. iPrism will not keep hunting
for an answer when configured with multiple name servers.
12.
iPrism must have a default route set. In more complex situations you may need to set static
routes as well. To edit iPrism’s default route, enter the desired IP address in the Default Route
field.
Chapter 7 System Settings
123
iPrism
Administration Guide
