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.

The Book is Here... and Now On Sale!

Searchable, convenient, complete TCP/IP information.
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Network Configuration and Management Protocols (BOOTP, DHCP, SNMP and RMON)
           9  Host Configuration and TCP/IP Host Configuration Protocols (BOOTP and DHCP)
                9  TCP/IP Dynamic Host Configuration Protocol (DHCP)
                     9  DHCP Configuration and Operation

Previous Topic/Section
DHCP Overview of Client and Server Responsibilities
Previous Page
Pages in Current Topic/Section
1
2
Next Page
DHCP General Operation and Client Finite State Machine
Next Topic/Section

DHCP Configuration Parameters, Storage and Communication
(Page 2 of 2)

Client-Specific Parameters and Client Identifiers

The DHCP server will also have certain parameters that are client-specific; the IP address itself is an obvious example, but there are other parameters that may apply to only certain clients on a network. These parameters are stored in some sort of a database, and indexed using a particular client identifier.

The default identifier consists of the client's IP subnet number and its hardware address. Thus, when a server gets a request from a particular subnet it can use the client's hardware address in the request to look up client-specific parameters and return them. The client identifier can be changed if a different identification scheme is desired.

Client Parameter Storage

Clients are also responsible for parameter storage, but of course, only their own parameters. Many of these will be obtained from the DHCP server, though some may be supplied in other ways. The specific implementation of the client determines which parameters it considers important and how they are discovered.

Configuration Parameter Communication

Communication of configuration parameters between DHCP clients and servers is accomplished using DHCP options, which replace BOOTP vendor information fields. A number of options were defined when DHCP was first created, and additional new ones have been created over the years. There are today several dozen of these options. Obviously, the ability to have so many different parameters automatically delivered to a client provides a great deal of host configuration flexibility to administrators. DHCP options are described further in the section on DHCP message formats.


Previous Topic/Section
DHCP Overview of Client and Server Responsibilities
Previous Page
Pages in Current Topic/Section
1
2
Next Page
DHCP General Operation and Client Finite State Machine
Next Topic/Section

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!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



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.