DNS Tools


There are various DNS Tools that you can use, these range from a single ping message to bespoke tools that were built to fully diagnose DNS. These tools are now commonly integrated into network diagnostic tools as they can help you fully understand what network problems that you are having whether it’s a simple IP conflict or an internet connection issue.

Pings and trace route will show you if a packet is successfully transmitted between you and the remote server. A ping will be a small message around 32 bytes so this is much better than sending a big webpage if it is going to fail anyway. A trace route will show all of the hops between you and remote server this could be as many of 30 which could mean that your packet could travel around the world many times before it reaches its destination.

Bespoke DNS tools such as NSLookup and DIG will show you more detailed information about the DNS part of the network. These will show you information about the individual records instead of just the IP address of the hostname. They will tell you where the name servers are pointed and the Time to Live (TTL) of each records.

NSLookup is used on Windows operating systems, this tool has been depreciated in some environments and now favour the Dig Command. NSlookup would translate the hostname to the IP address and not much else. This is ok for basic DNS testing but for more advance DNS diagnostic tools then you should use DIG.

The dig command is more advance and will give you more information about a DNS query. DIG comes with Linux from the installation of the operating system. DIG is not automatically installed on Microsoft Windows Operating Systems but you can download DIG from the Internet systems Consortium https://www.isc.org/downloads/ .


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