Black Box DSL LAN Extender 400 User Manual page 23

DHCP Lease Time
Specify the amount of time you want the IP information assigned by the DSL LAN Extender CP device to
remain in effect for the DHCP clients. This feature lets you build in an automatic termination date for
DHCP-assigned IP information. This helps prevent system administrators from worrying about a limited
number of IP addresses being allocated to DHCP clients that no longer need them (for example, PCs that
are no longer in service). If the DHCP client fails to renew the lease within the specified time, the lease
expires and the DSL LAN Extender CP device can reassign the IP address to another client.
In most cases, 30 day (720 hours) is a good starting DHCP Lease value (you can always increase or
decrease this value later).
To specify the duration of the DHCP lease:
1. Use the <Up/Down> arrow keys to position the cursor beside the Days field next to the DHCP Lease
Time option.
2. Type the number of days (up to 999) you want the IP information to stay in effect.
3. If you want to define the number of hours you want for the lease time, in addition to the specified
number of days, press the <Right> arrow key to move the cursor to the Hours field. (For example, to
specify a DHCP lease time of 1-½ days, specify 1 for the days and 12 for the hours.)
4. Type the desired number of hours (up to 99). Press <Ctrl-s> to save the new settings.
Configuring DHCP Clients
To allow machines on your local LAN to receive their IP information from the DSL LAN Extender CP
device, you must configure each machine as a DHCP client. The following section describes how to
configure a PC running Windows 98 as a DHCP client. (Perform these steps for each machine on your
local LAN you want to be a DHCP client.)
1. From the Windows 98 desktop, open the Start menu and choose the Settings/Control Panel command.
The Control Panel window appears.
2. Double-click the Network icon. The Network dialog box appears.
3. Click the TCP/IP -> (Adapter Name) item in the list at the top of the dialog box. (Adapter Name = the
name of the network interface card installed in the machine.) Click the Properties button. The TCP/IP
Properties dialog box appears.
4. Click the IP Addresses tab. The IP Addresses options appear.
5. Select the Obtain an IP address automatically option. Click OK in all the open dialog boxes. Follow
the instructions that appear on screen (for example, you must restart the machine to implement the
changes you made).
Impleme nting New DHCP Settings
If you change the DHCP settings you defined using the DSL LAN Extender software, for each DHCP
client, follow the instructions below to update the client with the new settings.
1. Display the MS-DOS Prompt window.
2. Type winipcfg, then press the <Enter> key. The IP Configuration dialog box appears.
3. Click the Release button.
4. Click the Renew button. Click OK. Exit from the MS-DOS Prompt window.
© 2002 Black Box Corporation
DSL LAN Extender 400 User's Guide
Page 17