Setting The Dhcp Server Configuration; Defining Dhcp Pools - Motorola Solutions WiNG 5.2.6 Reference Manual

8 - 16 WiNG 5.6.2 Access Point System Reference Guide

8.3 Setting the DHCP Server Configuration

Dynamic Host Configuration Protocol (DHCP) allows hosts on an IP network to request and be assigned IP addresses
as well as discover information about the network where they reside. Each subnet can be configured with its own
address pool. Whenever a DHCP client requests an IP address, the DHCP server assigns an IP address from that
subnet's address pool. When the DHCP server allocates an address for a DHCP client, the client is assigned a lease,
which expires after an pre-determined interval. Before a lease expires, wireless clients (to which leases are assigned)
are expected to renew them to continue to use the addresses. Once the lease expires, the client is no longer permitted
to use the leased IP address. The DHCP server ensures all IP addresses are unique, and no IP address is assigned to
a second client while the first client's assignment is valid (its lease has not expired). Therefore, IP address
management is conducted by the DHCP server, not an administrator.
AP-6532, AP-7131, AP-7161 and AP-8132 model access points have an internal DHCP server resource. However,
AP-6511 and AP-6521 models do not have an onboard DHCP server resource and an external resource must be used.
The DHCP server groups wireless clients based on defined user-class option values. Clients with a defined set of user
class values are segregated by class. A DHCP server can associate multiple classes to each pool. Each class in a pool
is assigned an exclusive range of IP addresses. DHCP clients are compared against classes. If the client matches one
of the classes assigned to the pool, it receives an IP address from the range assigned to the class. If the client doesn't
match any of the classes in the pool, it receives an IP address from a default pool range (if defined). Multiple IP
addresses for a single VLAN allow the configuration of multiple IP addresses, each belonging to different subnet.
Class configuration allows a DHCP client to obtain an address from the first pool to which the class is assigned.
A single DHCP server configuration is supported by the access point, no separate DHCP policies can be defined and
maintained. For more information, refer to the following:
•

Defining DHCP Pools

• Defining DHCP Server Global Settings
• DHCP Class Policy Configuration
8.3.1 Defining DHCP Pools
A pool (or range) of IP network addresses and DHCP options can be created for each IP interface configured. This
range of addresses can be made available to DHCP enabled wireless devices within the network on either a
permanent or leased basis. DHCP options are provided to each DHCP client with a DHCP response and provide DHCP
clients information required to access network resources such as a default gateway, domain name, DNS server and
WINS server configuration. An option exists to identify the vendor and functionality of a DHCP client. The information
is a variable-length string of characters (or octets) that has a meaning specified by the vendor of the DHCP client.
To define the parameters of a DHCP pool:
1. Select Configuration > Services > DHCP Server. The DHCP Pool tab displays by default.