26 Chapter 2 Understanding the installation environment209226-BUnderstanding how Instant Internet works with an existingIP address serverOnly one IP address server is allowed on a network—either your existing BootPor DHCP server or the Instant Internet unit. If you already have a BootP or DHCPserver or do not want to use Instant Internet as a DHCP server, you must assign astatic IP address to the Instant Internet unit and then be sure the DHCP option forobtaining an IP address is automatically enabled for your workstation. See“Setting a workstation to get its IP address from Instant Internet or your existingDHCP server” on page 87. You have two options when assigning a static IPaddress to Instant Internet. You can:• Use the Instant Internet unit’s MAC address to reserve a static IP address forInstant Internet before you begin the installation. For more information, see“Assigning a static IP address to Instant Internet using a BootP or DHCPserver” on page 77.• Allow your existing DHCP server to assign a dynamic IP address to theInstant Internet unit during the installation and then turn that dynamic IPaddress into a static IP address.Either method accomplishes the same task of assigning a static IP address toInstant Internet.After you assign a static IP address to the Instant Internet unit, you must do twothings on your DHCP server:1 Exclude that static IP address from the range (or scope) of IP addresses on theDHCP server.2 Configure your DHCP server to use Instant Internet as the gateway and DNSproxy. Your DHCP server then points the workstations to use Instant Internetas their gateway and DNS proxy, see “Configuring your DHCP server to useInstant Internet as the gateway and DNS proxy” on page 78.For details on setting up your network to use a DHCP server other than InstantInternet, refer to “Preparing a TCP/IP network with an existing BootP or DHCPserver” on page 76.
