LINUX has a built-in firewall called netfilter, configurable through iptables. There is a user friendly Ubuntu command-line tool called ufw to configure this firewall. All three should be already installed in your Ubuntu LINUX. (Probably you don't want to mess with snort!)
By default, the firewall is not turned on!
You must activate it manually.
For the purpose of working with your firewall, it may be useful to additionally install its
graphical user interface:
sudo apt install gufw
And run it:
sudo gufw
You will see this:
If you move the "Status" switch to the right, the firewall will be turned on. Now enter this command-line:
- sudo ufw status
You should see "Status: active".
This will survive a reboot.
You can reach the gufw graphical user interface without command-line
when you enter "firewall" in your application-finder
("Show Apps" button on Ubuntu taskbar). Of course you must enter the superuser password here,
as you must do when running any sudo commandline.
Remember to read the documentation, especially when you use P2P applications,
because ports may be closed now!
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