Changing NameServers and DNS Cache

Ever change a nameserver at your Domain Registrar and wonder why it takes so long for the domain to point to your new web site? The answer may be that you are using a DNS Caching service such opendns.com or google’s public dns. The Cache doesn’t update automatically but on a set schedule. If you don’t want to wait, your caching service may allow you to refresh it manually. For instance, both Google and Opendns allows anyone to flush the Cache for a particular domain without even logging in:

  1. Refresh the OpenDns cache
  2. Refresh Google Public DNS
  3. Open DNS refresh page is particularly helpful as it shows locations of all of its DNS servers throughout the world and the ip address that each has listed for your domain. Even if you don’t use OpenDNS this give you a great visual of how a change in your nameserver propogates the change in your web servers’ ip throughout the internet. If after flushing the cache the servers reflect the correct IP address for your webserver, you know that any delays in DNS propogation are likely due to DNS caching and/or local DNS cache or configuration.

    Another thing to keep in mind is that you may need to flush the DNS Cache on your own website. On Windows this is done by opening a Command windows and typing

    ipconfig /flushdns
    

    It should return with

    Windows IP Configuration
    Successfully flushed the DNS Resolver Cache.
    

    One other tip: if you are curious to know whether others are experiencing resolution issues, go to an online proxy site such as Zend2.com, type in your domain, and see the result. Often you will see the new website here before you see it locally. Timings differ due to the time it takes to propagate through the internet and caches to be updated.

    Some helpful reference links:

Charlie

Recent Posts

Fix Your Smart Home – Stop Tasmota Devices From Switching Randomly

While working on fixing my KuLED light switches from magically but unexpectedly switching on, I…

2 months ago

Using WP-CLI to Access MySQL Running in A LAMP Docker Container

WP-CLI is a great command line tool to help you manage Wordpress. I had trouble…

4 months ago

Dunzip – Download and Unzip in Linux With One Command

Tired of downloading zip or tar files, decompressing, and then having to delete the compressed…

5 months ago

Backing Up an SD Card or Hard Drive to A VHD File (Virtual Hard Disk)

  The Microsoft Virtual Hard Disk - An Ideal Backup Image Format Microsoft's Virtual Hard…

5 months ago

Ultimate Ad-Free Browsing

Browser getting cluttered with Ads ? Want to achieve a nearly total ad-free browsing experience…

11 months ago

How to Monitor Your Home Remotely With Skype

Want to peek in on your dog ? Have an elderly parent or friend that…

11 months ago