Web Hosting How-Tos

  Home arrow Web Hosting How-Tos arrow Page 2 - How to Link a Domain Name to a Dynamic...
Web Hosting Articles  
Web Hosting FAQs  
Web Hosting How-Tos  
Web Hosting News  
Web Hosting Reviews  
Web Hosting Security  
Weekly Newsletter 
 
Developer Updates  
Free Website Content 
 RSS  Articles
 RSS  Forums
 RSS  All Feeds
Write For Us 
Contact Us 
Site Map 
Privacy Policy 
Support 
 USERNAME
 
 PASSWORD
 
 
  >>> SIGN UP!  
  Lost Password? 
WEB HOSTING HOW-TOS

How to Link a Domain Name to a Dynamic IP
By: Barzan 'Tony' Antal
  • Search For More Articles!
  • Disclaimer
  • Author Terms
  • Rating: 5 stars5 stars5 stars5 stars5 stars / 16
    2008-06-11

    Table of Contents:
  • How to Link a Domain Name to a Dynamic IP
  • The Theory
  • Let’s Do It!
  • Closure

  • Rate this Article: Poor Best 
      ADD THIS ARTICLE TO:
      Del.ici.ous Digg
      Blink Simpy
      Google Spurl
      Y! MyWeb Furl
    Email Me Similar Content When Posted
    Add Developer Shed Article Feed To Your Site
    Email Article To Friend
    Print Version Of Article
    PDF Version Of Article
     
     

    SEARCH WEB HOSTERS

    TOOLS YOU CAN USE

    advertisement

    How to Link a Domain Name to a Dynamic IP - The Theory


    (Page 2 of 4 )

    We’re going to keep the theory to a minimum; that's a promise! First, domain names are held in a so-called name server. Thanks to domain names we can enter names in our browsers for URLs without being required to memorize those IP digits. In our everyday lives, software such as web browsers and mail clients handle the DNS resolutions. We call “resolution” the necessary process of discovering the IP to which a domain name points.

    To simplify this, imagine the following: the DNS server is a huge server with hundreds of entries containing the appropriate IP addresses for each domain name. This is straightforward in the case of static IP addresses. However, this gets trickier when it deals with dynamic IPs because the server must be notified in real-time to update its entries. It must also be told that the maximum caching time should be set to a minimum.

    The DNS cache was designed to reduce the load on DNS servers. There is a specific TTL (time to live) time interval during which a DNS is “valid.” The TTL is the maximum amount of transmissions (iterations). Until this limit is reached (TTL expires), a “resolution” can be cached -- meaning that clients won’t request an update.

    As mentioned earlier, with dynamic IPs, the main name space server must be notified as soon as possible, whenever the IP address changes, to update its records immediately. DNS services that provide Dynamic DNS services too also usually supply a client-side application that manages these queries (if another IP change occurs then notify the name server). This is the whole system in a nutshell.

    Networking components such as routers, for example, that have DDNS as an built-in feature are usually assigned to a predefined name space server. That’s the way their firmware was designed, and dynamic IP assignments are told to the DNS hosting service. This eliminates the need to run the stand-alone “ddclient” application.

    The aforementioned DDNS client is often called a ddclient (Linux client). Another network maintenance utility which is widely used is the nsupdate. Using the latter to notify and execute update queries on name space servers requires appropriate security measures (authentication and permissions by DNSSEC), i.e.: HMAC-MD5 hash keys.

    In the next section we’ll talk about practical real-world applications. Until then, please glance over to the diagram below. By now you should understand how DDNS works but a diagram like this may help to plant the whole concept in your long-term memory. As you can see, the ddclient notifies the DNS server (name space server); in the diagram, this is show as the new IP variable written right on the arrow.


    (Amateur sketch done in less than a minute)


    More Web Hosting How-Tos Articles
    More By Barzan 'Tony' Antal

    WEB HOSTING HOW-TOS ARTICLES

    - Phishing Scams: An Overview and How to Detec...
    - Tips for Safe Downloading Online
    - How To Avoid Spam
    - How to Get Into Ethical Hacking
    - How to Prevent Drive-by Downloads
    - Facebook Timeline Tips and Tricks
    - How to Keep Up with Facebook`s Changes
    - Wi-Fi Network Security Tips
    - Tips for Safe Online Holiday Shopping
    - Facebook Privacy: Keeping Up with the Const...
    - Tips for Facebook Privacy
    - How to Cover Your Tracks on the Web
    - SSH Keys for FileZilla and Putty in Cpanel
    - How to Create a Filezilla FTP User
    - How to Install FileZilla Server

    Developer Shed Affiliates

     




    © 2003-2017 by Developer Shed. All rights reserved. DS Cluster - Follow our Sitemap