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Do you need a Firewall on Linux?

admin by admin
April 21, 2020
in Lập Trình Linux
23
Do you need a Firewall on Linux?



What is Linux firewall? Do you need? How to set up and configure it. Everything in this video.

In addition, you will learn how to setup and configure the Uncomplicated Firewall (ufw) both graphically and through the terminal. And how to configure a simple stateful firewall through iptables for more advanced users.

You can also read a text version of this video

Commands used in the video:
sudo ufw enable
sudo ufw status verbose
sudo ufw allow ssh
man ufw
sudo iptables -N TCP
sudo iptables -N UDP
sudo systemctl enable iptables.service
chmod +x iptables_ArchLinux.sh
sudo ./iptables_ArchLinux.sh

Iptables script:

Tags: #AverageLinuxUser #Linux #firewall

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Comments 23

  1. Punch Gamer بنش جيمر says:
    2 years ago

    my gufw opening many ports in Reports and when i enable the gufw its blocking my internet please help

    Reply
  2. Professor Moriarty says:
    2 years ago

    They are building a tower block the bottom of the tower block is loosely locked it only needs to look after two things. All the other floors have balcony doors that have many things in them like a desktop GUI. Some of the GUI can be seen and contacted by the outside. Linux the kernel the firewall only knows what it should keep out it is a one-way firewall. GUI without a firewall can be logged onto the GUI can be seen and brute force can be used for password guessing. The longer you can be seen the longer they have a chance of eventually cracking this password. A firewall hides your desktop GUI from the outside world. It protects your desktop from other desktops.

    Sometimes in an office environment you can see somebody else's computer try it just select network and you may see a computer name. It is probably the same name as the user: fred-HP-Z840-workstation.
    So you have the name which is fred you now only need the password most passwords are simple easy to remember and easy to brute force. If Fred had the firewall switched on I would not be able to log onto his computer.

    Reply
  3. Kimi Tuukkanen says:
    2 years ago

    Thank you very much for this video about firewalls. Enabling firewall makes me feel safe. 🙂

    Reply
  4. new view says:
    2 years ago

    does it make sense if I have guwf installed on parrot os?

    Reply
  5. Casperian says:
    2 years ago

    I activate a firewall through my vpn service. Is that the same as use a Linux firewall?? Can and if so, should I run both a Linux firewall and my VPN’s firewall??

    Reply
  6. Aitch Pea says:
    2 years ago

    Just a note. UFW is installed and enabled by default in Ubuntu 16.04 and later, but gufw shows the service as disabled. Enabling it with gufw doesn't seem to affect it, but does allow you to then actually use the GUI.

    Reply
  7. Yasin Yasar says:
    2 years ago

    I use windows firewall. Is better than iptables

    Reply
  8. Mouldy CPU says:
    2 years ago

    I need iptables because I use a script to control my packet filtering settings.

    Reply
  9. Ralph W says:
    2 years ago

    I'm running Ubuntu 18.04 LTS with cinnamon on 3 machines all connected to my home wifi network. However I can't see or connect the machines on the network. I haven't enabled a firewall. When I was running 16.04 without cinnamon, I was able to connect my machines and transfer files over the network. Any ideas?

    Reply
  10. Kevin Quinn says:
    2 years ago

    Three steps to improve your security:

    1. Run Linux
    2. Activate GUFW
    3. Run your browser in Firejail

    Reply
  11. debeeriz says:
    2 years ago

    i found the firewall got in the way when sharing files, so i disabled it back in 2012 never had a problem

    Reply
  12. Musical Neptunian says:
    2 years ago

    "What a big, beautiful Wall! This wall is a fire wall! Better than steel or concrete! Anyone who does not like my bigly fire wall is an enemy of the people!"
    – Donald

    Reply
  13. Georgios Roumeliotis says:
    2 years ago

    @Average Linux User I just bought the new hp spectre x360 and I have a really bad time trying to fix touchscreen and trackpad issues (I use Debian) can you tell me how i can fix it ?

    Reply
  14. Prakhar Dev Gupta says:
    2 years ago

    This music is so nice!! How can I have it?? Thanks in advance 🙂

    Reply
  15. Mr Sammotube says:
    2 years ago

    Thanks for this – it is amazingly reassuring to just switch on the firewall with gufw!

    Reply
  16. Виталий Труфанов says:
    2 years ago

    Good job! Can you make a small tutorial about bash scripting?

    Reply
  17. Hasibur Rahman Jitu says:
    2 years ago

    (off Topic) Do review on MX Linux. (its popularity is rising increasingly)

    Reply
  18. liOnux says:
    2 years ago

    Hi,
    Do you know how to test firewall job ?

    Reply
  19. Ovid Llorito says:
    2 years ago

    Hello Average Linux User, can do an install and review of the new version Refracta? =)

    Reply
  20. jawad mansoor says:
    2 years ago

    Thanks

    Reply
  21. 0x Ovi says:
    2 years ago

    How to fast Linux?
    I use in vm wear
    I useing Kali linux vm image
    Plzz reply

    Reply
  22. Farukh Al-Bashir says:
    2 years ago

    To have gufw or ufw always enabled at startup you need : #sudo su #systemctl enable ufw.service

    Reply
  23. Serge says:
    2 years ago

    Hello ALU,
    Recommending the Arch script is a bad idea. If you don't understand what iptables does don't use it!
    By the way iptables is deprecated and will be replaced by nftables.
    There are Linux distributions which have a detailed iptables enabled OOTB like Fedora and Linux Lite for instance.
    You need a deep understanding of networking to be able to use iptables correctly. So in doubt be cautious!!!
    Cheers

    Reply

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