If you’re looking for a solid firewall solution for your CentOS 7 server, you may be wondering how to install the Firewall Service. This process is actually very simple, and in this article we’ll walk you through the steps. So if you’re ready to protect your system from unauthorized access, let’s get started!
What is Firewall Service on Centos 7
Centos 7 is the latest stable release of Red Hat Enterprise Linux. The default firewall configuration in CentOS 7 is based on the iptables package and its successor, firewalld. iptables is a user space application that can be used to configure the tables provided by the Linux kernel firewall (Netfilter).
FirewallD, on the other hand, is a userspace daemon providing a dynamic firewall. Also, it works at the network level rather than the packet level.
To install Firewall just follow the steps:
1. Install the base system
2. Install the firewall-applet
3. Configure the firewall with system-config-firewall
4. Disable the firewall and use iptables to do it.
6. Enable the firewall with firewalld and system-config-firewall (GUI)
8. Enable masquerading on the external interface using iptables
9. Check the configuration using Firewall Status GUI
Network Barrier Analysis
Network monitoring is a crucial element in the design and implementation of information technology. There is a large number of tools available to monitor the performance, availability, and security of your network. There are many network monitoring tools available like Nmap, ssdeep, nessus, etc. Nmap is a security scanner or network exploration tool.
Moreover, this is used to scan the host and port on the network. SSDeep is a scanner that uses deep search to scan the target hosts and ports on the network. Also, Nessus is an OpenSource vulnerability scanning software for Linux, Windows, and mainframe. So, Nessus provides automated vulnerability analysis and can identify security issues by using plugin-based architecture.
Nmap Network Scanning Tool
Nmap is a free and open source utility for network discovery and security auditing. So, it was designed to rapidly scan large networks, although it works fine against single hosts too. Many systems and network administrators may also find it useful for tasks such as network inventory.
Also, it helps in managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network. What services (application name and version) those hosts are offering and what operating systems (and OS versions) they are running?
What type of packet filters/firewalls are in use and dozens of other characteristics? This is what should be considered. But this software was designed to rapidly scan large networks.
However, it works fine against single hosts too. Nmap runs on all major computer operating systems, and both console-based and graphical versions are available. In addition to the classic command-line Nmap executable, the Nmap suite includes an advanced GUI and results viewer (ZenMap).
This includes flexible data transfer, redirection, debugging, sniffing, and scripting engine (Ncat). Also, you will get a utility for comparing scan results (Ndiff) and a packet generation and response analysis tool (Nping).
Thus, it is most commonly used for advanced network troubleshooting and analysis. However, with its ability to read different types of capture files, it can also be used as a packet sniffer for security purposes. Also, it includes capturing and analyzing relevant packets to detect intrusions and other computer security incidents using its content inspection capabilities.