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

n70products by n70products
December 20, 2024
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Using dig +trace to understand DNS resolution from start to finish
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The dig command is a strong software for troubleshooting queries and responses obtained from the Domain Name Service (DNS). It’s put in by default on many working techniques, 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 the entire 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 on your zones or domains. 

First, let’s briefly assessment how a question recursive receives a response in a typical recursive DNS decision state of affairs: 

  1. You because the DNS consumer (or stub resolver) question your recursive resolver for www.instance.com. 
  2. Your recursive resolver queries the foundation nameserver for NS data for “com.” 
  3. The foundation nameserver refers your recursive resolver to the .com High-Degree Area (TLD) authoritative nameserver. 
  4. Your recursive resolver queries the .com TLD authoritative server for NS data of “instance.com.” 
  5. The .com TLD authoritative nameserver refers your recursive server to the authoritative servers for instance.com. 
  6. Your recursive resolver queries the authoritative nameservers for instance.com for the A document for “www.instance.com” and receives 1.2.3.4 as the reply. 
  7. Your recursive resolver caches the reply at some point of the time-to-live (TTL) specified on the document and returns it to you.

The above course of mainly seems to be like this:

Step 1

Using dig +trace to understand DNS resolution from start to finish 1

Step 2

Using dig +trace to understand DNS resolution from start to finish 2

Step 3

Using dig +trace to understand DNS resolution from start to finish 3

Step 4

Using dig +trace to understand DNS resolution from start to finish 4

Step 5

Using dig +trace to understand DNS resolution from start to finish 5

This course of happens each time you kind a URL into your net browser or hearth up your e mail consumer. 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 occasions; and if the pace with which you obtain a solution is sluggish, then it can 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.   

Learn more at IBM NS1 Connect

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Technical Staff Lead, IBM® NS1 Join®



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