Signs of a DNS issue can include, but not limited to:
- Slow website load times
- Unable to watch/stream video
- Discrepancies in load time between two different websites
- No images displayed on a website
Firstly, we’ll need to understand what a DNS is and how it works:
A Domain Name System is the equivalent of a phone book. It has a large directory of domain names and translates them into IP’s for the computers to understand. For example, when you type in www.rtechsupport.org to your web address, your ISP views the DNS associated with the domain name and translates it into an IP address thus connecting you to the website.
So why do these issues exist?
What happens is that due to either connectivity problems, different paths, miss-configuration, load, caching (and the list can go on) your ISP may or may not be able to retrieve the appropriate information so as to guide your browser to retrieve the page you wish it to load from the server you want it to get it from.
Navigate to Control Panel > Network and Internet > Network and Sharing Centre > Change adapter settings on the left hand side > Double click on your WiFi > Properties > Double click on TCP/IPV4 and select “Use the following DNS server addresses”. In this box type one of the following options:
- Google DNS – 220.127.116.11
- Google DNS – 18.104.22.168
So how does changing to Google DNS fix these issues?
Due to the fact that Google is pretty well connected, it has the infrastructure to cache DNS information effectively, sometimes more effectively than many ISPs. So by having users from many ISPs ask the same DNS servers for name resolution, it can offer a single view of the web (and the rest of the Internet) to users from many providers, regardless of the state of the ISPs (caching) DNS servers.
So how does Google do it?
By providing the same DNS view to everyone that queries their Public DNS infrastructure, while at the same time being well connected on key parts of the Internet (Tier-1 providers).