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DHCP Lease Address Pools, Ranges (Scopes) and Address Management
(Page 2 of 4)
Lease Address Ranges (Scopes)
In its simplest form, the address
pool takes the form of a list of all addresses that the DHCP server
has reserved for dynamic client allocation. Along with each address,
the server stores certain parameters, such as a default lease length
for the address and other configuration information to be sent to the
client when it is assigned that address (for example, a subnet mask
and the address of a default router). All of this data is stored in
a special database on the server.
Of course, many clients will request
addresses from this pool. Most of these clients are equals
as far as the DHCP server is concerned, and it doesn't matter which
address each individual client gets. This means most of the information
stored with each of the addresses in a pool may be the same except for
the address number itself. Due to this similarity, it would be inefficient
to have to specify each address and its parameters individually. Instead,
a range of addresses is normally handled as a single group defined
for a particular network or subnet. These are not given any particular
name in the DHCP standards, but are commonly called scopes. This
term has been popularized by Microsoft in its DHCP server implementations.
Other operating systems sometimes just call these blocks of addresses
ranges, but I prefer scope so that is what I am using
Key Concept: Each DHCP server maintains a set of IP addresses that it uses to allocate leases to clients. These are usually contiguous blocks of addresses assigned to the server by an administrator, called DHCP address ranges or scopes.
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Version 3.0 - Version Date: September 20, 2005
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