What is Public DNS
Public DNS is an alternative to using an internal DNS server. You can set up a public DNS server as the primary DNS server in just about every home router and on any computer. Using a public DNS address is a common solution to not hosting your own DNS servers. Public DNS servers are hosted for your use as an alternative method of configuration, public DNS servers also provide a excellent tool for trouble shooting suspected DNS issues.
Troubleshooting Internet Connectivity
If your network is experiencing problems reaching the internet the first thing to do would be to check your equipment. If the gear all seems to be working fine, you might try attempting to ping a public DNS server. The command line syntax is
If you are connected to the network and cannot reach the internet checking your DNS settings is a good place to begin troubleshooting. For a list of DNS troubleshooting tools click here
Navigate to the following google web site for step by step instructions. http://code.google.com/speed/public-dns/docs/using.html.
I have also created a short version for you here.
Open up the properties dialog of your internet connection Local Area Connection Properties and open Internet Protocol 4( TCP/IPv4) dialog.
Select the Advanced button select the DNS tab and then click ‘Add’
Inside the DNS server dialog add the Google server address of 184.108.40.206 click Add and then repeat the process adding 220.127.116.11
Click OK then OK then OK again if needed to close the network properties dialog box.
Now close and reopen your internet browser then attempt to go to the web site that would not open previously.
As mentioned above you can go to the DNS troubleshooting section for more information on specific tools and techniques used to troubleshoot a variety of different issues.
DNS is a very powerful set of rules and protocols by which the name of your website is used for it’s address rather than using an IP address. It would be much more difficult to try to remember IP addresses each time you wanted to visit a website. DNS solves this issue for us by translating a domain name (Domain Name Services) into the IP address actually being used to designate a particular website. No two are the same, and it is a bunch of addresses, over 1 billion and that number is expected to double each coming year. There is so much more to say about DNS and public DNS services, it goes beyond the level of this article.
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