How to install Wireshark on Ubuntu operating system?
1. First, open up a terminal window in your Ubuntu operating system.
2. Update the package lists and install prerequisite packages by executing the following command: sudo apt-get update && sudo apt-get install -y libpcap-dev
3. Next, download the latest version of Wireshark for Ubuntu from their website using the “wget” command: wget https://1.as.wireshark.org/linux/wireshark-3.4.0.tar.xz
4. Extract the downloaded Wireshark package with the “tar” command: tar xvf wireshark-3.4.0.tar.xz
5. Navigate to the extracted Wireshark directory: cd wireshark-3.4.0/
6. Run the configuration script in order to prepare Wireshark for compilation: ./configure
7. Compile and install Wireshark by executing the following command: make && sudo make install
8. Finally, add your user to the wireshark group so that you can use Wireshark without root privileges: sudo usermod -a -G wireshark $USER
9. Reboot the system to apply changes: sudo reboot
What is better, Linux CentOS or Ubuntu?
The answer to this question depends on your specific needs and preferences. Linux CentOS is generally considered to be a more reliable and secure operating system, while Ubuntu is more user-friendly and offers a wider range of software packages. Ultimately, it is up to the user to decide which one is better for their particular situation.
What is a label in Linux?
In Linux, a label is a name given to a filesystem in order to distinguish it from others. Labels are used to manage and keep track of multiple filesystems on a Linux system. They provide a convenient way to refer to filesystems without having to remember exact mount points or device names.
How to install Tomcat in Linux and Ubuntu?
1. To install Tomcat on Linux and Ubuntu systems, you will need to first update your system. Use the following command in your terminal window to update your system:
sudo apt-get update
2. Once your system is updated, download the Tomcat .tar.gz archive using wget command from tomcat.apache.org:
3. Now, create a directory to store Tomcat archive:
4. Move the downloaded Tomcat tar to the newly created directory:
mv apache-tomcat-* ~/tomcat
5. Extract the tar file in the tomcat directory:
tar xvfz apache-tomcat-*tar.gz
6. Tomcat is now ready to be used. To start Tomcat server, open your terminal and execute the following command:
7. You can access the Tomcat server in your browser, using the URL: http://localhost:8080
8. To stop Tomcat server, type the following command in your terminal:
How do I set up Sudo in Linux?
1. Login as the root user on the system.
2. Type the command: apt-get install sudo
3. To add a new user to the sudoers file, type the command: usermod -a -G sudo <username>
4. To edit the sudoers file, type the command: visudo
5. Add the user to the sudoers file with the text below: <username> ALL=(ALL) ALL
6. To confirm the changes, type in the command: sudo -l
7. All users added to the sudoers file will now be able to use sudo commands.
How to disable or set SELinux to permissive mode?
1. To disable or put SELinux into permissive mode, you can use the following command:
sudo setenforce 0
2. You can also edit the /etc/selinux/config file and set the SELinux mode to permissive. To do this, open the config file in a text editor, find the line that reads SELINUX=enforcing, then change it to SELINUX=permissive. Save and close the file, then reboot your system for the change to take effect.
3. You can also use the graphical interface provided by your Linux distribution. Look for the settings for SELinux in the Security or Administrative Tools section. You can then select the permissive mode and save the settings.
What are the Linux network commands?
1. ping: Tests a network connection.
2. traceroute: Traces the route taken by packets over an IP network.
3. ip: Displays network configuration and routing information.
4. netstat: Displays active network connections & protocol statistics.
5. arp: Displays, adds, and deletes entries in the Address Resolution Protocol (ARP) table.
6. hostname: Displays or sets a system's hostname.
7. ifconfig: Configures network interface parameters.
8. nmap: Network exploration and security auditing tool.
9. nslookup: Queries DNS name servers for DNS information.
10. route: Views and manipulates the IP routing table.
What are the different types of port scans in Linux?
1. TCP connect scan: This type of port scan uses the full three-way TCP handshake to connect to the target port in order to determine if it is open.
2. TCP SYN scan: This type of scan sends a SYN segment to the target port without completing the three-way handshake. If the port is open, then a SYN-ACK will be sent as a response; if not, then an RST packet will be sent.
3. FIN Scan: This type of scan sends FIN packets to the target port; if the port is open, then an RST packet is sent as a response.
4. XMAS Tree Scan: This type of scan sends a TCP segment to the target port with the FIN, URG, and PSH flags all set to 1. If the port is open, then an RST packet will be sent as a response.
5. NULL Scan: This type of scan sends a TCP segment to the target port with no flags set. If the port is open, then an RST packet will be sent as a response.
6. ACK Scan: This type of scan sends an ACK segment to the target port; if the port is open, then no response is sent, but if it is closed, then an RST packet will be sent in response.