Add A Firewall to Debian Linux with UFW
20#Firewall #Debian #UFW
Full steps can be found at https://i12bretro.github.io/tutorials/0821.html
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What is UFW?
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The Uncomplicated Firewall (ufw, and gufw - a Graphical User Interface version of the same) is a frontend for iptables and is particularly well-suited for host-based firewalls. Ufw provides a framework for managing netfilter, as well as a command-line interface for manipulating the firewall. - https://wiki.debian.org/Uncomplicated%20Firewall%20%28ufw%29
01. Log into the Debian device
02. Run the following commands in a terminal window:
# update software repositories
sudo apt update
# install ufw
sudo apt install ufw -y
# enable ufw
sudo ufw enable
# output the ufw status
sudo ufw status
# add some default firewall rules
sudo ufw default deny incoming
sudo ufw default allow outgoing
# if a webserver is running, allow the incoming traffic
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
# to allow incoming ssh connections, open port 22
sudo ufw allow 22/tcp
# output the ufw status
sudo ufw status
# to install a graphical user interface for ufw, install gufw
sudo apt install gufw -y
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