Technical data

Configuring the DHCP Server
7.5 Using DHCP GUI to Configure DHCP
Searching for a MAC or IP Address
To search for a MAC or IP address:
1. Click the Server/Security tab.
2. Choose Preload MAC Addresses from the drop-down list.
3. Click Find.
4. Enter the MAC or IP address you want to locate.
5. Click OK.
Refreshing the MAC Addresses Window
To refresh the MAC address window so that it reflects the current status of the
database, click Refresh.
7.5.3 Configuring Parameters for Clients
DHCP allows you to configure many client parameters in addition to the client’s
IP address. For example you can configure the IP address of a client’s bind server
and its DNS domain name.
There are three ways to assign configuration parameters to DHCP clients. You
can assign parameters to:
• A specific client
To assign parameters to a specific client, use the node configuration options
described in Section 7.5.3.2. This is called a node group and is identified by
the client’s MAC address.
• A net or subnet
To assign parameters to all clients in a subnet, use the subnet configuration
options described in Section 7.5.3.1. This is called a subnet group and is
identified by the subnet in which the client is being configured. You will likely
configure each client within a subnet with similar parameters, for example,
DNS domain name, DNS server, default route, and so forth.
• A group of clients
To assign parameters to a group of clients that are not in the same subnet,
use the group configuration options described in Section 7.5.3.3. This is called
an include group. You can declare a node or subnet group as a member of an
include group to pull in the include group’s parameters.
After the DHCP server finds an IP address for a client, it matches the client’s
MAC address against your node groups and the client’s subnet against your
subnet groups, pulling any parameters from matched groups into the list of
parameters to be sent to the DHCP client. If a match occurs against both a
subnet and a node group, and a particular parameter is assigned in both the
subnet and the node group, then the value from the node group is used. When
a match occurs on a subnet or node group that is a member of an include group,
the DHCP server pulls in parameters from the include group also.
7.5.3.1 The Subnets Tab
A subnet is a segment of a logical network that has been divided into smaller
physical networks. Use the Subnets tab to configure parameters to be passed to
DHCP clients according to the subnet in which they reside.
Configuring the DHCP Server 7–35