DHCP server

TCP/IP has become for more and more installations the preferred network
protocol, also pushed by the explosive growth of the Internet, which is
based on TCP/IP.
When using a network with only Windows95 and WindowsNT4 based systems,
you will have to assigned the IP-addresses manually (Windows98 includes an
IP-Auto-Configuration system
), but more and more server-systems offer the
automatic assignment of IP-addresses via:
DHCP (Dynamic Host Configuration Protocol)

Commercial Message:

The installation of the DHCP-server on Windows NT4 server (the DHCP-server
is NOT included in Windows NT4 workstation )
is very simple:

In the Network-configuration,
tab: Services, click on “Add
and then select:
Microsoft DHCP Server

The following notice will be displayed:

The system running the DHCP-server (distributing IP-addresses to other systems)
itself MUST use a static IP-address (manually assigned) , it can NOT request
to receive an IP-address from any DHCP-server (itself or another DHCP server).
Like after all changes to the network configuration, you have to reboot:

Configuration of the DHCP-server

Although the DHCP-server is listed
as a Networking service, it is NOT
configured from the Network applet
(the Properties button is grayed out)
The “DHCP – Manager” has been
added to the menu for the
“Administrative Tools”
You need to define now a range of IP-addresses
to be distributed.
This range is called: “Scope“.
To be able to define Scope, click first on the
entry “Local Machine” to expand the entry,
the “+” -sign needs to change to the “-“-sign.
Only then you are able to select from the
menu: “Scope” the option “Create

You assign the range of IP-addresses to be assigned by DHCP-server
( in the example: all IP-addresses between and

usually, an IP-address is NOT assigned permanently, but only for a limited
time, called the “Lease Duration”.
On selected the “OK”-button, you will be asked on whether to activate
the scope, select “Yes”:

The yellow light-bulb indicates, that
the scope is now active and that the
DHCP-server is ready to assign the
To display the IP-range (“Scope”) for
viewing/editing, select from the menu
“Scope” the option “Properties”

Setting up a connected Windows systems to use the DHCP-server is very simple:

In the Network-configuration,
select the properties for the
TCP/IP-protocol and just make
sure, that it defines to
“obtain an IP address automatically”

To verify the assigned IP-address on a Windows95/98 system, run the
WINIPCFG” program (usually from the RUN-menu)(On Windows NT, use IPCONFIG):

In this example, DHCP assigned the IP-address
But there is no “Default gateway” defined !

TCP/IP requires more than just the IP-address, for communication outside
the local network-cable (the local “subnet”), it needs to know the IP-address
of the Gateway (also called Router).
DHCP can be configured to provide also this information to the clients:

make sure, that your Scope is selected
(highlighted in blue), then select from the
menu: “DHCP Options”, then “Scope”

From the list of
“Unused Options”, select
“Router”, then use the
Once the “Router” is
an “Active Option”,
click on the button
“Value” to define the
IP-address for the Router.
On the expanded Windows,
click on “Edit Array”,
allowing then to enter
the IP-address of the
Router, then select the
“Add”-button to get the
new values displayed in
the list of IP-addresses.
Press “OK” to exit this
The IP-address of the
Router is displayed.
Press “OK” to close the
DHCP-Options window.

The DHCP-Mananger is now displayed
for the scope also the option for the

When now checking on Windows95/98 with WINIPCFG:

the IP-address for the “Default Gateway” is defined.
If your configuration requires the use of WINS, it can be also configured
as an option of the DHCP-server.

DHCP can also be used to assigned IP-addresses for incoming RAS-

To view the list of IP-address already
assigned, select from the menu: “Scope”
the option “Active Leases”
In this example, is assign
to a LAN user, while
is assigned to the Modem to handle
incoming RAS TCP/IP-connections.

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