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Using dig +trace to understand DNS resolution from start to finish

April 18, 2024
in Blockchain
Reading Time: 2 mins read
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The dig command is a robust software for troubleshooting queries and responses acquired from the Area Title Service (DNS). It’s put in by default on many working methods, together with Linux® and Mac OS X. It may be put in on Microsoft Home windows as a part of Cygwin. 

One of many many issues dig can do is to carry out recursive DNS decision and show all the steps that it took in your terminal. That is extraordinarily helpful for understanding not solely how the DNS works, however for figuring out if there is a matter someplace inside the decision chain that trigger decision failures in your zones or domains. 

First, let’s briefly overview how a question recursive receives a response in a typical recursive DNS decision situation: 

You because the DNS shopper (or stub resolver) question your recursive resolver for www.instance.com. 

Your recursive resolver queries the basis nameserver for NS data for “com.” 

The foundation nameserver refers your recursive resolver to the .com Prime-Stage Area (TLD) authoritative nameserver. 

Your recursive resolver queries the .com TLD authoritative server for NS data of “instance.com.” 

The .com TLD authoritative nameserver refers your recursive server to the authoritative servers for instance.com. 

Your recursive resolver queries the authoritative nameservers for instance.com for the A report for “www.instance.com” and receives 1.2.3.4 as the reply. 

Your recursive resolver caches the reply at some point of the time-to-live (TTL) specified on the report and returns it to you.

The above course of mainly appears like this:

Step 1

Step 2

Step 3

Step 4

Step 5

This course of happens each time you sort a URL into your net browser or fireplace up your e-mail shopper. This illustrates why DNS reply pace and accuracy are so essential: if the reply is inaccurate, you could must repeat this course of a number of instances; and if the pace with which you obtain a solution is sluggish, then it should make every little thing you do on-line appear to take longer than it ought to.  

Driving each DNS reply pace and accuracy is on the core of the IBM® NS1 Join® worth proposition.   

Study extra at IBM NS1 Join

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Technical Workforce Lead, IBM® NS1 Join®



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