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DHCP Lease Reallocation Process
(Page 1 of 2)
When a DHCP client starts up for
the first time and has no lease, it begins in the INIT (initialize)
state and goes through the
allocation process described in the preceding topic
to acquire a lease. The same process is used when a lease ends, if a
lease renewal fails, or some error or other happening causes a client
to need a new lease.
Situations Where Reallocation Is Performed
There are certain situations in which
a client starts up while it still has a lease already in place. In this
situation, the client does not need to go through the entire process
of getting an IP address allocation and a new lease setup. Instead,
it simply tries to re-establish its existing lease, through a process
that I call reallocation.
There are two primary circumstances
under which a client performs reallocation rather than allocation:
- Power On With Existing Lease: The length
of time that a client lease lasts can range from minutes to years; it
is entirely a matter of the lease
length policy set for the network and
client by the administrator. Many, if not most client machines are not
left connected to the network 24 hours a day; they are turned on during
the day and then shut down at night, and also shut down on weekends.
A client with a very short lease that is shut down and then later started
again will probably find that its lease has expired, and will have to
get a new one. However, if a lease is longer than a few days, it will
still probably be in effect when the client starts up again.
- Reboot: Clients are also sometimes rebooted,
to install new software or correct a problem. In this case even when
the lease length is very short, the restarting client will still have
a valid lease when it starts up.
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Version 3.0 - Version Date: September 20, 2005
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