Firewalls play an important role when it comes to the security of Linux systems and networks. Before knowing about the free Linux firewalls which are available out there, it is important first to understand the importance of Firewall. Firewall is a security guard for managing safety and privacy between the internal and external network. It does that by controlling and managing both the incoming and outgoing network traffic. You can only make legitimate connections when you start using firewalls and blocks the connections, which are not defined.
Here are the ten most popular Linux firewalls, which are free.
It is the most popular firewall available for the Linux users. In fact, it was the first defense system made for serving the security of Linux. Iptables filters the packets in the network with the kernel present in the firewall. Apart from that, the users are also presented with the material of the packet filter ruleset. It scans the system rapidly as it only inspects the packet headers. You can modify the rules of the inspections as per the requirements. It also does the backup of the data and restores the files in case of accidental deletion.
The key features of IPCop firewall are that it is secure, highly configurable, and has a user-friendly interface. This firewall management system has a well-designed web interface to provide security. It can prove to be very vital for the local PCs and for the PCs which are used in the local business. It provides a secure environment in the internet world. The users can also monitor the graphics performance of the CPU, memory, disk, and the network. The software can be easily upgraded to have the latest version of it.
It is another popular open source firewall meant for the Linux system. The Netfilter connection presents in the firewall tracks facilities for the stateful packet filtering. The best thing of Shorewall is that it supports a variety of firewalls, gateway, and router application. It is a centralized firewall administration for the Linux system. It also supports multiple ISP along with support for masquerading, port forwarding, and VPN.
UFW- Uncomplicated Firewall
UFW is the default firewall available in the Ubuntu servers. If you find Iptables a complicated firewall, then you should try UFW, which is a simpler version of it. This firewall supports IPV6 and extends the logging option in the system. You can also monitor status and integrate the system with the applications. You can modify the rules of the UFW as per your needs.
It is a powerful firewall for the Linux server that serves the clients with a user-friendly interface. It also supports IPV6 and has anti-spoofing features. It also does the traffic shaping for the customers and provides the users with advanced monitoring functions. It also does real time monitoring of bandwidth usage and connection.
ConfigServer Security Firewall
It is a cross-platform firewall, which can be used in many operating systems and provides a versatile platform to the clients to manage the security of the network. The concept of the firewall is built in Stateful packet inspection firewall. It has a highly developed intrusion detection system that keeps on checking for the exploits over the network. It notifies the client with an email when it suspects malicious activities in the server or when one is using excessive resources. The ConfigServer Security Firewall can be integrated with many web hosting panels like the cPanel and the Webmin.
It is also a firewall designed on the concept of stateful packet inspection. It was originally developed by IPCop firewall and later gained its own identity to be a versatile firewall. It is a bi-directional firewall system that secures the web servers by using proxies of HTTP and FTP. It prevents snort intrusion and protects the mail servers using SMTP and POP3 proxies. It provides a real time network traffic logging to its users.
It is an open source Linux firewall that comes with a highly configurable web based interface. It supports DMZ, LAN, wireless network, and external connection. It does HTTPS filtering to create a secure environment by supporting proxies. It does real time content filtering and monitors even the activities of the firewall. It provides the users with backup and restoration facilities.
It is yet another open source Linux based firewall, which can be used for small office and home office. The firewall is designed in a manner that it serves the clients with high modularity and flexibility. IPFIre can be deployed as a proxy server, VPN gateway, and a firewall. It does content filtering and provides support to the users through Wiki, chats, and forum. It has an inbuilt intrusion detection system that creates a high level of security.
If you are looking for a reliable firewall for the FreeBSD server, then you should try pfSense. It is developed on the concept of stateful packet filtering. It provides many features that are available for the premium version of the other firewall at a little cost. This firewall is highly configurable and can be easily upgraded. It can be deployed as a router, perimeter firewall, DNS server, and DHCP. It does traffic shaping and provides with real time information about the server. It also balances the inbound and outbound load.
The firewalls mentioned above are among the most loved firewall meant for the Linux server. You can also try many other firewalls such as ClearOS and Checkpoint to secure your Linux system. Try to find the firewall that can meet most of your requirements. Each of these firewalls has something in common including the aim to provide security, but still, the distinct features of the firewalls make them unique in their way. However, all the firewalls present in the list only allows the legitimate connection and blocks the connects, which are not adequately defined for your safety in the web.