Teach you how to turn on/off Ubuntu firewall

teach you how to turn on/off Ubuntu firewall

Installation Method

sudo apt-get install UFW

Of course, this is a graphical interface (relatively humble), in the new GUFW to search for a try ...

How to use

1 Enable

sudo UFW enable

sudo ufw default deny

Function: Turns on the firewall and shuts down all external access to the local computer (normal external access) with the system boot.

2 Close

sudo ufw disable

2 View firewall status

sudo UFW status

3 opening/Disabling the appropriate port or service example

sudo UFW allow 80 allows external access to 80 ports

sudo ufw delete allow 80 disallow external access to port 80

sudo ufw allow from 192.168.1.1 allows this IP access to all native ports

sudo UFW deny SMTP prevents external access to the SMTP service

sudo ufw delete allow SMTP to delete a rule established above

sudo ufw deny Proto TCP from 10.0.0.0/8 to 192.168.0.1 Port 22 is going to deny all TCP traffic from 10.0.0.0/8 to 192.168.0.1 Address of 22 port

You can allow all RFC1918 networks (LAN/WLAN) to access this host (/8,/16,/12 is a network rating): sudo ufw allow from 10.0.0.0/8sudo UFW enable from 172.16.0.0/ 12sudo UFW allow from 192.168.0.0/16

Recommended Settings

sudo apt-get install UFW

sudo UFW enable

sudo ufw default deny

This setting is already secure and if you have special needs, you can use sudo ufw allow to turn on the service.

Teach you how to turn on/off Ubuntu firewall