Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.
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.
|If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!|
Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.