Put the following in a script and call it start-firewall.sh #!/bin/sh ufw allow ssh ufw enable ufw default deny ufw allow http ufw allow https And then make it executable and run it by doing $ chmod + x start-firewall.sh $ sudo ./start-firewall.sh To learn more, read the man page.

firewall - how to configure nat on shorewall for we have two servers with overlapping networks, both servers using shorewall as default firewall, both servers connected via l2l vpn strongswan, as networks overlapping we have connectivity issue. how to nat this networks on shorewall? both server ubuntu 18.04 Ubuntu Server Part 3: A Simple Firewall - YouTube Try watching this video on www.youtube.com, or enable JavaScript if it is disabled in your browser. How to Install ConfigServer Firewall (CSF) on Ubuntu Jul 22, 2019

How to Configure a Firewall on Ubuntu 18.04? - OSRadar

Security - Firewall | Server documentation | Ubuntu The default firewall configuration tool for Ubuntu is ufw. Developed to ease iptables firewall configuration, ufw provides a user-friendly way to create an IPv4 or IPv6 host-based firewall. ufw by default is initially disabled. From the ufw man page:

Installing pi-hole on Ubuntu 18.04 LTS - Linux Included

How to Check Firewall Status in Ubuntu Firewall To check firewall status use the ufw status command in the terminal. sudo ufw status. If the firewall is enabled, you will see the list of firewall rules and the status as active. If the firewall is disabled, you will get the message “Status: inactive”. How to Manage Firewall (UFW) on Ubuntu 16.04 | 18.04 Ubuntu comes with a firewall module by default, but it is disabled after installing… It also comes with a configuration tool called Uncomplicated Firewall (UFW) which can be used to manage firewall app….The tool is user-friendly and allows system admins to manage Ubuntu firewall module.. How to configure UFW Firewall on Ubuntu 16.04 So, the firewall is kind of a program that can allow/deny requests on the server’s ports based on the rules we set. Let’s say, you are setting up a web server. And in a web server, we essentially have to allow incoming connections on port 80 (HTTP), 443 (HTTPS) and 22 (SSH/SFTP). Incoming requests on all the other ports must be closed.