How To Install tcpdump on CentOS 8

tcpdump is A network traffic monitoring tool

Introduction

In this tutorial we learn how to install tcpdump on CentOS 8.

What is tcpdump

Tcpdump is a command-line tool for monitoring network traffic. Tcpdump can capture and display the packet headers on a particular network interface or on all interfaces. Tcpdump can display all of the packet headers, or just the ones that match particular criteria. Install tcpdump if you need a program to monitor network traffic.

We can use yum or dnf to install tcpdump on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install tcpdump.

Install tcpdump on CentOS 8 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install tcpdump using dnf by running the following command:

sudo dnf -y install tcpdump

Install tcpdump on CentOS 8 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install tcpdump using yum by running the following command:

sudo yum -y install tcpdump

How To Uninstall tcpdump on CentOS 8

To uninstall only the tcpdump package we can use the following command:

sudo dnf remove tcpdump

tcpdump Package Contents on CentOS 8

/usr/lib/.build-id
/usr/lib/.build-id/b1
/usr/lib/.build-id/b1/9d7d41fe4469a0fc016f2de89092288b705601
/usr/lib/.build-id/f1
/usr/lib/.build-id/f1/d71bef4aadea4d1ba2c7a9749723f0fb46657f
/usr/sbin/tcpdump
/usr/sbin/tcpslice
/usr/share/doc/tcpdump
/usr/share/doc/tcpdump/CHANGES
/usr/share/doc/tcpdump/CREDITS
/usr/share/doc/tcpdump/README.md
/usr/share/licenses/tcpdump
/usr/share/licenses/tcpdump/LICENSE
/usr/share/man/man8/tcpdump.8.gz
/usr/share/man/man8/tcpslice.8.gz

References

Summary

In this tutorial we learn how to install tcpdump on CentOS 8 using yum and dnf.