This for all my Pakistani friends who are using PTCL DSL. Usually People who are using PTCL complains that there DSL link is sync but still they are facing problem in browsing a web site. What they have to do is just first ping their gateway then the DNS. If gateway is pinging but the DNS is not use the following solution.
Before we start firstly we have to understand the work of DNS. When you type an address like www.yahoo.com in your browser address bar, the computer doesn’t know where yahoo.com points and it will therefore ask the DNS server.
The job of a DNS server is to translate this human-readable web address (like www.yahoo.com) into a computer-readable number also known as an IP address (184.108.40.206). Once your computer knows the IP location of a web domain name, it opens the website in your browser.
DNS is such an integral part of our Internet life working behind the scenes every time we connect to a website. In most situations, our Internet Service Provider specifies the DNS Server address that we key into the browser network settings or the router.
Now back to our problem. To solve this problem, we look at a simple and reliable service called OpenDNS that speeds up your Internet connection and also handles some other very important issues. There are no software to install, it’s very easy to set up and the price is just right - $0.
To use OpenDNS, all you have to do is open your Network Connections or Router’s settings page and update the default DNS server to point to the OpenDNS nameservers that are 220.127.116.11 and 18.104.22.168.
Unlike the DNS servers of your less reliable ISP, OpenDNS servers store the IP addresses of millions of websites in their cache so it would take less time to resolve your requests. So if you have asked for an IP address of a website that has been previously requested by another OpenDNS user, you will get the reply instantly.
Another huge advantage of using OpenDNS is that it blocks phishing websites from loading on your computer. It uses data from Phishtank, a community site that is also used by Yahoo! Mail to determine if some particular website is part of any online phishing scam.
OpenDNS also takes care of any typos that you commit while typing the name of popular websites. For instance, if you type www.gogle.com omitting the additional “o” by mistake, OpenDNS will open the main www.google.com site automatically.
If you are a parent worried about kids visiting adult websites on the home computer, you can configure OpenDNS to block any adult website from loading on the computer. In fact, quite a few business places use OpenDNS to block social sites like MySpace and Facebook on employee computers.
Power users can assign abbreviations or OpenDNS Shortcuts to access their favourite websites more quickly.
For instance, you can set “mail” as a shortcut for http://mail.google.com/ or something like “a” for www.reallylongname.com - just type the shortcut to access the site. A good alternative for browser based bookmarks and it works across all computers where you have logged in to your OpenDNS account.