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Tag Archive : Linux

MTR command – A network diagnostic tool for Linux

Many network diagnostic tools are already a part of Linux. For example, Nslookup command, Host command, Dig command, Traceroute command, and more. But, sometime in the past, there was a guy called Matt Kimball. He was just not satisfied with the traceroute command in the 90s, so he decided to make a new one – the MTR command.

What is the MTR command?

The MTR command is a great small tool to trace the route to a target and get information for the round-trip. It is an alternative to the common traceroute command and was written by Matt Kimball created in 1997 to perform functions both from traceroute command and ping command. It provides more information in comparison with the other two commands and is just as easy to use on Linux. Roger Wolff further improved the software in 1998, and the name was changed to My Traceroute. 

On Linux, you can use the MTR command straight through the Terminal application. If you don’t have it installed on your Linux distro, you first need to install it.

On Ubuntu, you can do it by typing: sudo apt update. Then press Enter and write your password. After that, type: sudo apt -y install mtr. Again press Enter.

How does it work?

The MTR command sends ICMP (Internet Control Message Protocol) data packets to the target you set. The target that you decide could be a hostname/domain name or an IP address (IPv4 or IPv6). 

You can use it using the following syntax:

mtr option value target

Mtr – shows which command you are using.

Option – it can use one of the following options to improve your probe further:

-h – help.

-v – version.

-r – report. You need to stop it by pressing the “C” key, and after that, you get a report.

-w – extended report.

-c – number of ICMP messages to be sent.

-s – the size of ICMP data packages.

-t – Curses-based terminal interface.

-n – don’t resolve the hostnames.

-g – GTK+ interface.

-p – split – Split-user interface.

-l – Raw output.

-a – address.

-i – seconds between the ICMP messages.

-u –use UDP.

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How to clear the DNS cache?

Cleaning the DNS cache will remove all the DNS records that were stored inside your computer. After that, there won’t be any A or AAAA records showing which websites you have visited before. Here you can learn to flush the DNS cache!

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​Ping command basics for testing your network

The ping command might seams too basic for many people, but it is still around, and there is a reason for that. It is one of the fastest and easiest ways to find out if a particular device is connected. Just ping it, and in a matter of moments, you will see a clear answer. 

​What is the Ping command? 

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