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64
C
4: C
R
HAPTER
OMMAND
EFERENCE
DNS Name Lookup
The Internet has a service called the Domain Name Service
(DNS) which allows users to enter an easily remembered
host name, such as
, instead of numerical IP
www.3Com.com
addresses to access Internet resources. The Internet Firewall
has a DNS Lookup tool that returns the numerical IP
address of a host name.
Select DNS Name Lookup from the Choose a diagnostic
tool menu. A window similar to that in
Figure 23
is
displayed.
Type the host name to lookup in the Look up the name box
and click Go. The Internet Firewall then queries the DNS
server and displays the result at the bottom of the screen.
The IP address of at least one DNS Server must be present
on the Network Settings tab for the DNS Name Lookup
feature to function.
Figure 23 DNS Lookup Window
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