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How to install DIG and NSLOOKUP on Linux | Commands

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1. How to install dig and nslookup on Linux
2. How to use dig and nslookup Linux
3. How to use nslookup Linux

The use of the network in server environments or on client computers is essential to allow both local and external communications to be carried out as expected, but some error, no matter how minimal, will prevent all processes from being fully executed. ( Internet access , file transfer, updates, etc).

For this reason, it is ideal whether we are administrators or not , to have utilities for network analysis and thereby determine the root of the errors. In this case, Linux offers us two functional commands for this type of analysis, such as the dig and nslookup commands, which we will talk about in detail.

What is the dig command

Dig (Domain Information Gopher) is a command line utility with which it is possible to carry out DNS searches by consulting the name servers and displaying the final result.

By default, the dig command sends the DNS query to the nameservers hosted in the /etc/resolv.conf directory, but we may manually indicate the server to which it should point.

The syntax for using dig is as follows:

  dig   [server]   [name]   [type]  

The specified values ​​are:

  • Server: refers to the IP address or hostname of the nameserver to query in Linux
  • Name: indicates the name of the resource record to search
  • Type: is the type of query requested by dig, it can be an A record, an MX record, a SOA record, etc.

What is Nslookup

Nslookup (name server lookup), is a command used to perform DNS lookups in Linux, its output can include complete DNS details such as the IP address, MX records of a domain or the NS servers of a particular domain.

When using nslookup we have two modes that are:

  • Interactive mode with which it is possible to query the name servers to access information about various hosts and domains
  • Non-interactive mode with which we can print only the name and information requested for a host or domain

The syntax for nslookup is as follows:

  nslookup   [option]  

Today's Linux systems already include the dig and nslookup utilities by default, but we may have accidentally deleted them.

Now let's see how to install and use these commands on Linux.

1. How to install dig and nslookup on Linux

Step 1


In case of using CentOS or Red Hat we must execute the following command:

 dnf install  bind  -utils 

If we use Debian or Ubuntu we will execute the following:

 apt  install  dnsutils 

In case of using ArchLinux we execute:

 pacman -Sy dnsutils 

image

Step 2


Once installed we can validate the version used with the following command:

 dig -v 

image

2. How to use dig and nslookup Linux

Step 1


Once installed we are ready for use, we can use dig to query a domain name and retrieve information from it, for example, we execute:

  dig   technowikis   .com  

image

Step 2


In this case we have details such as:

  • Remote computer IP
  • Consultation time
  • Date and time the query was made

If we only want to view the IP of the device, we must add the parameter + short like this:

 dig technowikis.com +  short  

image

Step 3


To view the MX records we execute the following:

 dig technowikis.com MX +  short  

image

We see that the details are much more complete.

Step 4


You can access TTL details with the following command:

  dig   technowikis   .com   TTL  

image

Step 5


To consult all DNS records we execute:

  dig   technowikis   .com   ANY  +  noall  +  answer  

image

3. How to use nslookup Linux

Step 1


With nslookup if we want to obtain domain information we execute:

  nslookup   technowikis   .com  

image

Step 2


We can see the MX records using the following parameter:

 nslookup -query = mx technowikis.com 

image

Step 3


To review the NS records we enter:

 nslookup -query = ns technowikis.com 

image

Step 4


If it is necessary to access the SOA records we enter:

 nslookup -query = soa technowikis.com 

image

With dig and nslookup we can perform domain and network analysis tasks to detect possible errors either in our equipment or in the objects that participate in the communication.


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