Computers use IP addresses to connect to one another. When you type a web address in your browser, your computer routes the domain address through a Domain Name System (DNS), the DNS translates the human-friendly web address into a computer-friendly IP address.
Every ISP usually has their own DNS server, but it’s not always the fastest. Also third-party DNS servers can also have other advantages, like content filtering. Google Public DNS and OpenDNS are probably the best free DNS server you may consider as great alternatives to the DNS server offered by your ISP.
In most cases, the IP addresses used by your ISP’s domain name servers are automatically set by your ISP via the Dynamic Host Configuration Protocol (DHCP).
Configuring your network DNS settings on Windows PC
Before you change your DNS settings, be sure to write down the current server addresses or settings on a piece of paper. It is very important that you keep these numbers for backup purposes, in case you need to revert to them at any time.
Changing DNS server settings on Windows 7
1. Go the Control Panel of your PC.
2. Click Network and Internet, then Network and Sharing Center, and click Change adapter settings.
3. Select the connection for which you want to configure.
4. To change the settings for an Ethernet connection, right-click Local Area Connection, and click Properties.
To change the settings for a wireless connection, right-click Wireless Network Connection, and click Properties.
5. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
6. Select the Networking tab. Under This connection uses the following items, select Internet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 (TCP/IPv6) and then click Properties.
7. Click Advanced and select the DNS tab. If there are any DNS server IP addresses listed there, write them down for future reference, and remove them from this window.
8. Click OK.
9. Select Use the following DNS server addresses. If there are any IP addresses listed in the Preferred DNS server or Alternate DNS server, write them down for future reference.
10. Replace those addresses with the IP addresses of new DNS servers.
11. Restart the connection you selected in step 3.
12. Test that your DNS setup is working properly.