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)
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
|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 220.127.116.11 and 18.104.22.168):
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 22.214.171.124.
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
|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, 126.96.36.199 is assign|
to a LAN user, while 188.8.131.52
is assigned to the Modem to handle
incoming RAS TCP/IP-connections.