the internet has a service called the domain name service (dns) which allows users to enter an easily remembered host name, such as www.3com.com, instead of numerical ip 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