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DHCP Lease Address Pools, Ranges (Scopes) and Address Management
(Page 1 of 4)
Simpler host configuration methods
such as BOOTP (or DHCP manual allocation for that matter) associate
a single IP address with each client machine. DHCP dynamic addressing
removes this one-to-one correspondence, in favor of flexible address
mapping to clients on an as needed basis. The clients no
longer own the addresses but lease them from the true owner, the server.
Obviously, then, a primary job of both a DHCP server and the administrator
of that server is to maintain and manage these client addresses.
Address Pool Size Selection
The set of all addresses that a DHCP
server has available for assignment is most often called the address
pool. The first issue related to address management is ensuring
that the address pool is large enough to serve all the clients that
will be using the server. The number of addresses required depends on
a number of factors:
- Number Of Clients: Obviously.
- Stability and Frequency of Use Of Clients:
If most clients are left on and connected to the network all the time,
you will probably need to plan on an address for each one. In contrast,
if you are serving part-time employees, or consultants who frequently
travel, you can get away with sharing a smaller number of addresses.
- Consequences Of Over-Allocation: If having
certain clients be unable to get a free address is a problem, you need
to more carefully manage the address pool to ensure that you don't run
out. If having a client not get an address is never acceptable,
make sure you have as many or more addresses as clients.
I'm sure you've probably noticed
that these issues are similar to those
that I raised in discussing lease lengths
earlier in this section. In fact, the two matters are intimately related.
Generally speaking, having more addresses gives the administrator the
luxury of using longer leases. If you are short on addresses
you probably need to use shorter leases to reduce the chances of any
unused addresses continuing to be allocated to devices not needing them.
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Version 3.0 - Version Date: September 20, 2005
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