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 Overview of Client and Server Responsibilities
(Page 2 of 2)
DHCP Client Responsibilities
A DHCP client is any device that
sends DHCP requests to a server to obtain an IP address or other configuration
information. Due to the advantages of DHCP, most host computers on TCP/IP
internetworks today include DHCP client software, making them potential
DHCP clients if their administrator chooses to enable the function.
The main responsibilities of a DHCP client are:
- Configuration Initiation: The client takes
the active role by initiating the communication exchange that
results in it being given an IP address and other parameters. The server,
in contrast, is passive and will not really do anything for the
client until the client makes contact.
- Configuration Parameter Management: The
client maintains parameters that pertain to its configuration, some
or all of which may be obtained from a DHCP server.
- Lease Management: Assuming its address
is dynamically allocated, the client keeps track of the status of its
own lease. It is responsible for renewing the lease at the appropriate
time, rebinding if renewal is not possible, and terminating the lease
early if the address is no longer needed.
- Message Retransmission: Since DHCP uses
the unreliable User
Datagram Protocol for messaging, clients
are responsible for detecting message loss and retransmitting requests
if need be.
DHCP Device Roles and Interaction
The DHCP server and client obviously
play complementary roles. The server maintains configuration parameters
for all clients; each client maintains its own parameters, as discussed
in the next topic. IP address assignment and lease creation, renewal,
rebinding and termination are accomplished through specific exchanges
using a set of eight DHCP message types, which we will see later in
this section. To accomplish this messaging, special rules are followed
to generate, address and transport messages, which are explained
in a topic in the section on DHCP messaging.
Like BOOTP, DHCP also supports a
third type of device, the relay agent. Relay agents are neither
clients nor servers, but rather intermediaries that facilitate cross-network
communication between servers and clients. They are described in more
detail in the
section on DHCP implementation and features
(where you can also find more of the implementation details of servers
and clients.)
Key Concept: DHCP servers are devices programmed to provide DHCP services to clients. They manage address information and other parameters and respond to client configuration requests. DHCP clients are TCP/IP devices that have been set to use DHCP to determine their configuration. They send requests and read responses, and are responsible for managing their own leases, including renewing or rebinding a lease when necessary. |
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! |
|
|
Home -
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.
|