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Lesson 6
Troubleshooting Name Resolution
4-63
domain that contains the name it is trying to resolve. The DNS server in
Windows
Server 2003 comes preconfigured with root hints for the Internet root name
servers, as
shown in Figure 4-18.
F04pm18
Figure 4-18
The Root Hints tab in a DNS server’s Properties dialog box
Off the Record
The addresses of the Internet root name servers rarely change, and it is
not likely that a Windows DNS server would be unable to contact even one of
these servers,
unless someone modifies the root hints. It is more common for a network
connectivity prob-
lem to be affecting the server’s communication with the root name servers.
Incorrect root hints are more likely to cause problems in a DNS namespace
that is iso-
lated from the Internet and contains its own internal root. If this is the
case, the person
who initially configured the DNS server probably forgot to add the internal
root name
server to the list of root hints, or typed the root name server’s address
incorrectly. Cor-
recting the root hints in the DNS console should resolve the problem.
It is also possible that the server is configured not to use recursion at
all. Windows
Server 2003 DNS servers use recursion by default, but it is possible to
prevent the
server from using recursion by selecting the Disable Recursion check box
under Server
Options in the Advanced tab in the server’s Properties dialog box. You can
also prevent
recursion when configuring a Windows DNS server to use forwarders. When you
dis-
play a DNS server’s Properties dialog box, you can select the Do Not Use
Recursion For
This Domain check box. This prevents the server from using any recursion,
should the
forwarder be unable to resolve a name. If you require the server to use
recursion, be
sure that these options are not selected.
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