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The editor will share with you how to turn on and off ubuntu Firewall. I hope you will get something after reading this article. Let's discuss it together.

Preface

Firewall (Firewall), also known as protective wall. It is a network security system located between the internal network and the external network. An information security protection system that allows or restricts the passage of transmitted data in accordance with specific rules.

The importance of firewalls to our network security is self-evident, but in the actual development process, we may

Need to turn on and off the firewall, so how to manage the firewall in Ubuntu. Let's take a look at it.

Installation method

Sudo apt-get install ufw

Of course, there is a graphical interface (relatively crude). Search gufw in Synaptic.

Usage

1 enable

Sudo ufw enable sudo ufw default deny

Function: turn on the firewall and turn off all external access to the machine at the same time as the system starts (local access is external normal).

2 off

Sudo ufw disable

2 View firewall status

Sudo ufw status

3 enable / disable the corresponding port or service example

Sudo ufw allow 80 allows external access to port 80

Sudo ufw delete allow 80 prohibits external access to port 80

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

Sudo ufw deny smtp prohibits external access to smtp services

Sudo ufw delete allow smtp deletes one of the rules established above

Sudo ufw deny proto tcp from 10.0.0.0Charger 8 to 192.168.0.1 port 22 to deny all TCP traffic from 10.0.0.0Charger 8 to port 22 of the 192.168.0.1 address

All RFC1918 networks (Lans / WLANs) can be allowed to access this host (/ 8, 16 and 12 is a network rating):

Sudo ufw allow from 10.0.0.0/8sudo ufw allow from 172.16.0.0/12sudo ufw allow from 192.168.0.0/16

Recommended settin

Sudo apt-get install ufw sudo ufw enable sudo ufw default deny

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

After reading this article, I believe you have a certain understanding of "how to turn on and off ubuntu Firewall". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!

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