Static allocation—The network administrator chooses
the IP address to assign to the client and the DHCP server sends
it to the client. A static DHCP allocation is permanent; it is done
by configuring a DHCP server and choosing a Reserved
Address to correspond to the MAC Address of
the client device. The DHCP assignment remains in place even if
the client logs off, reboots, has a power outage, etc.
Static
allocation of an IP address is useful, for example, if you have
a printer on a LAN and you do not want its IP address to keep changing,
because it is associated with a printer name through DNS. Another
example is if a client device is used for something crucial and
must keep the same IP address, even if the device is turned off,
unplugged, rebooted, or a power outage occurs, etc.
Keep these
points in mind when configuring a Reserved Address:
It is an address from the IP Pools.
You may configure multiple reserved addresses.
If you configure no Reserved Address,
the clients of the server will receive new DHCP assignments from
the pool when their leases expire or if they reboot, etc. (unless
you specified that a Lease is Unlimited).
If you allocate all of the addresses in the IP
Pools as a Reserved Address,
there are no dynamic addresses free to assign to the next DHCP client requesting
an address.
You may configure a Reserved Address without
configuring a MAC Address. In this case,
the DHCP server will not assign the Reserved Address to
any device. You might reserve a few addresses from the pool and
statically assign them to a fax and printer, for example, without
using DHCP.