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DHCP Address Assignment and Allocation Mechanisms
(Page 4 of 4)
The third option, automatic allocation,
can be used in cases where there are enough IP addresses for each device
that may connect to the network, but where devices don't really care
what IP address they use. Once an address is assigned to a client, that
device will keep using it. Automatic allocation can be considered a
special case of dynamic allocation: it is essentially dynamic
allocation where the time limit on the use of the IP address by a client
(the lease length) is forever.
In practice, automatic allocation
is not used nearly as much as dynamic allocation, for a simple reason:
automatically assigning an IP address to a device permanently is a risky
move. Most administrators feel it is better to use manual allocation
for the limited number of machines that really need a permanent IP address
assignment, and dynamic addressing for others. We'll discuss this more
in the next topic.
Key Concept: DHCP defines three basic mechanisms for address assignment. Dynamic allocation is the method most often used, and works by having each client lease an address from a DHCP server for a period of time; the server chooses the address dynamically from a shared address pool. Automatic allocation is like dynamic allocation but the address is assigned permanently instead of being leased. Manual allocation pre-assigns an address to a specific device, just as BOOTP does, and is normally used only for servers and other permanent, important hosts.
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Version 3.0 - Version Date: September 20, 2005
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