The devices contain an internal DHCP server. This server is typically used in branch offices that do not already have a DHCP server.
The wireless network generally contains a maximum of 10 access points or fewer, with the access points on the same IP subnet
as the device. The internal server provides DHCP addresses to wireless clients, direct-connect access points, and DHCP requests that are
relayed from access points. Only lightweight access points are supported. When you want to use the internal DHCP server, you
must set the management interface IP address of the device as the DHCP server IP address.
DHCP option 43 is not supported on the internal server. Therefore, the access point must use an alternative method to locate
the management interface IP address of the device, such as local subnet broadcast, Domain Name System (DNS), or priming.
An internal DHCP server pool only serves the wireless clients of that device, not clients of other devices. Also, an internal DHCP server can serve only wireless clients, not wired clients.
When clients use the internal DHCP server of the device, IP addresses are not preserved across reboots. As a result, multiple clients can be assigned with the same IP address. To
resolve any IP address conflicts, clients must release their existing IP address and request a new one. Wired guest clients
are always on a Layer 2 network connected to a local or foreign device.
DHCPv6 is not supported in the internal DHCP servers.