How to Configure a Firewall on a Linux Server?
A firewall is a program designed to protect a computer or network from unauthorized access, as well as from attacks from the internet. In this article, we will look at how to configure a firewall on a Linux server.
On a Linux server, the iptables utility is often used to configure the firewall. To get started with iptables, you need to make sure it is installed on your server. You can check this by running the command:
sudo iptables --version
If you have iptables installed, you can start configuring the firewall. It is important to remember that if you are not sure what you are doing, it is best to consult a specialist to avoid unforeseen problems.
To get started with iptables, you need to create a new rule. To do this, run the command:
sudo iptables -A INPUT -s 192.168.1.100 -j ACCEPT
In this case, we allow access to the server from IP address 192.168.1.100. You can create new rules, for example, to block specific ports or IP addresses.
After you have created the necessary rules, be sure to save them. To do this, run the command:
sudo iptables-save > /etc/sysconfig/iptables
Now the firewall configuration on the Linux server is complete. Remember that this is only a basic configuration, and for more complex scenarios you may need to explore the additional features of iptables.
Use a firewall to secure your server and network to prevent attacks and unauthorized access to your data. Be careful and accurate when configuring the firewall, and your server will be protected from threats.
