How to set up network proxy and firewall on Kirin OS?

How to set up network proxy and firewall on Kirin OS?

In today’s information age, network security has become a topic of great concern. When using Kirin operating system, network proxy and firewall settings are an important part of protecting the security of personal information. This article will introduce how to set up network proxy and firewall on Kirin operating system and provide corresponding code examples.

1. Network proxy settings

1. Open the terminal and enter the command sudo gedit /etc/environment to open the environment variable configuration file.

2. Add the following content to the opened file:

   http_proxy="http://proxy.example.com:port/"
   https_proxy="https://proxy.example.com:port/"
   ftp_proxy="ftp://proxy.example.com:port/"
   no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"

   Among them, proxy.example.com is the proxy server address, port is the proxy server port number. If there is no proxy server, you can delete the above configuration information.

3. Save and close the file.
4. Enter the command sudo source /etc/environment in the terminal to make the configuration take effect.
5. Check whether the proxy settings are effective. You can enter commands such as echo $http_proxy and echo $https_proxy to see if there is output.

Through the above steps, we successfully set up the network proxy on the Kirin operating system, protecting personal privacy and security.

2. Firewall settings

1. Kylin operating system uses iptables as the firewall software by default. First, open a terminal and use the following command to check whether iptables is installed:

   sudo apt-get install iptables

2. Enable the firewall and set the default policy. Enter the following command in the terminal:

   sudo iptables -P INPUT DROP
   sudo iptables -P FORWARD DROP
   sudo iptables -P OUTPUT ACCEPT

   Among them, the -P parameter specifies the default policy, DROP means dropping the packet, ACCEPT means Accept the packet.

3. Set up to allow specific ports through the firewall. For example, if you want to allow SSH connections through the firewall, you can enter the following command:

   sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT

   where the -A parameter indicates adding a rule to the rule chain, and the -p parameter specifies Protocol type, the --dport parameter specifies the target port, the -j parameter specifies the processing method, ACCEPT indicates accepting the data packet.

4. Save and apply the rule. Enter the following commands in the terminal:

   sudo iptables-save | sudo tee /etc/iptables.up.rules
   sudo iptables-restore < /etc/iptables.up.rules

Through the above steps, we successfully set up the firewall on the Kirin operating system and enhanced network security.

Summary:

Network proxy and firewall settings are important measures to protect the security of personal information. In this article, we introduce how to set up network proxy and firewall settings on Kirin OS and provide corresponding code examples. It is hoped that these settings can help readers strengthen their awareness of network security and protect personal privacy and information security.

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