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DHCP Leases, Lease Length Policies and Management
(Page 3 of 4)
Common Lease Durations
The administrator need not pick from
short and long lease durations. He or she can
compromise by choosing a number that best suits the network.
Some examples of lease times and the reasoning behind them:
Assigning Lease Length By Client Type
- One Hour Or Less: Ensures maximum IP address
allocation efficiency in a very dynamic environment where there are
many devices connecting and disconnecting from the network, and the
number of IP addresses is limited.
- One Day: Suitable for situations where
guest machines typically stay for a day, to increase IP
efficiency when many employees work part-time, or otherwise to ensure
that every day each client must ask again for permission to use an address.
- Three Days: This is the default used by
Microsoft. This alone makes it a popular choice.
- One Week: A reasonable compromise
between the shorter and longer times.
- One Month: Another compromise,
closer to the longer end of the lease time range.
- Three Months: Provides reasonable IP address
stability so that addresses don't change very often in reasonably static
environments. Also a good idea if there are many IP addresses available
and machines are often turned off for many days or weeks at a time.
May be used in a university setting to ensure that IP addresses of returning
students are maintained over the summer recess.
- One Year: An approximation of an infinite
lease; see below.
In fact, not only is the administrator
not restricted to a limited number of possible lease durations, it is
not necessary for the administrator to choose a constant lease length
policy for all clients. Depending on the capabilities of the DHCP server,
an administrator may select different lease lengths for certain clients
than others. For example, the administrator may decide to use long leases
for desktop computers that are permanently assigned to a particular
subnet and not moved, and a pool of short-leased addresses for notebooks
and visitors. In some DHCP implementations this can be done
by assigning clients to particular classes. Of course, this
requires more work (and may even require multiple servers.)
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Version 3.0 - Version Date: September 20, 2005
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