SUMMARY
A DHCP scope is an administrative grouping of computers running the DHCP
Client service. You create a scope for each subnet on the network to define
parameters for that subnet.
Each scope has the following properties:
- A unique subnet mask to determine the subnet related to a given IP
address.
- A scope name assigned by the administrator when the scope is created.
- Lease duration values to be assigned to DHCP clients with dynamic
addresses.
MORE INFORMATION
You MUST use DHCP Manager to create, manage, or remove scopes. The DHCP
database file (Dhcp.mdb) is a JET database that cannot be read by Microsoft
Access or other application editors.
To create a new DHCP scope, select the server in the DHCP Manager window,
and on the Scope menu, click Create.
A pop-up window is displayed requiring all necessary information to
configure the DHCP Server. To configure the new scope, type the appropriate
information into the following fields:
IP Address Pool
Field Description
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Start address Specifies the first IP address of the scope for the clients
End address Specifies the last IP address of the scope for the clients
Subnet mask Specifies the subnet mask for the client subnet
Exclusion Range
By specifying addresses to be excluded from a range, DHCP Manager will not
lease these addresses to requesting clients. An example of this is a UNIX
Tower or similar machine that cannot be reconfigured with a static IP
address outside of the intended/defined scope (for example, a corporate
DNS).
To implement several address scopes within one subnet on a single DHCP
server, create one continuous IP address range that includes all available
addresses within the subnet. Then, exclude necessary addresses or ranges
from within the defined scope.
For example:
Defined scope: 192.192.192.1 through 192.192.192.200
Excluded: 192.192.192.5 and 192.192.192.10 through 192.192.192.50
Available addresses: 192.192.192.1 through 192.192.192.4, 192.192.192.6
through 192.192.192.9, and 192.192.192.51 through 192.192.192.200
Lease Duration Unlimited
This option specifies that the DHCP lease assigned to a client will never
expire. This is not a recommended option and should be substituted through
the use of client reservations.
Lease Duration Limited to
The number of days, hours, and minutes that a DHCP client lease is
available before it must be renewed.
Name
The scope name is the name that describes this subnet and is displayed
after the IP address in DHCP Manager. The name can include any combination
of letters, numbers, hyphens, underscores, or blank characters.
Comment
This is an optional field.