A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It establishes a barrier between a trusted internal network and untrusted external network. Firewalls are often categorized as either network firewalls or host-based firewalls. Network firewalls filter traffic between two or more networks and run on network hardware. Host-based firewalls run on host computers and control network traffic in and out of those machines.
How Firewall Works :
Firewall match the network traffic against the rule set defined in its table. Once the rule is matched, associate action is applied to the network traffic. Rules can be defined on firewall based on the necessity and security policies of the organization. From the perspective of a server, network traffic can be either outgoing or incoming. Firewall maintains distinct set of rules for both the cases. Mostly the outgoing traffic, originated from the server itself, allowed to pass. Still, setting rule on outgoing traffic is always better in order to achieve more security and prevent unwanted
Incoming traffic is treated differently. Most traffic which reaches on firewall is one of these three major Transport Layer protocols- TCP, UDP or ICMP. All these types have a source address and destination address. Also, TCP and UDP have port numbers. ICMP uses type code instead of port number which identifies purpose of that packet.
Generation of Firewall :
> First Generation- Packet Filtering Firewall : Packet filtering firewall is used to control network access by monitoring outgoing and incoming packet and allowing them to pass or stop based on source and destination IP address, protocols and ports.
> Second Generation- Stateful Inspection Firewall : Stateful firewalls are able to determine the connection state of packet, unlike Packet filtering firewall, which makes it more efficient. It keeps track of the state of networks connection travelling across it, such as TCP streams. So the filtering decisions would not only be based on defined rules, but also on packet’s history in the state table.
> Third Generation- Application Layer Firewall : Application layer firewall can inspect and filter the packets on any OSI layer, up to application layer. It has ability to block specific content, also recognize when certain application and protocols (like HTTP, FTP) are being misused.
> Next Generation Firewalls (NGFW) : Next Generation Firewalls are being deployed these days to stop modern security breaches like advance malware attacks and application layer attacks. NGFW consists of Deep Packet Inspection, Application Inspection, SSL/SSH inspection and many fuctionalities to protect the network from these modern threats.
Types of Firewall :
> Host- based Firewalls : Host-based firewall are installed on each network node which controls each incoming and outgoing packet. It is a software application or suit of applications, comes as a part of operating system. Host-based firewalls are needed because network firewalls cannot provide protection inside a trusted network. Host firewall protects each host from attacks and unauthorized access.
> Network-based Firewalls : Network firewall function on network level. In other words, these firewalls filters all incoming and outgoing traffic across the network. It protects the internal network by filtering the traffic using rules defined on firewall. A Network firewall might have two or more network interface cards (NICs). Network-based firewall is usually a dedicated system with proprietary software installed.
With new and complex data security threats impacting your perimeter every day, it critical to monitor, manage and update security policies across your firewall on a continuous basis. Organizations also need to monitor their networks and firewalls at all times to identify and contain malicious activities. These activities require significant technology skills and 24X7 resource availability.
Security solution at CoreIP is aimed to protect your business from hackers attack and other Internet threats. We aim at running your business smooth without any worry about securing your data. CoreIP provides software and hardware firewall to protect your data from any malicious attacks and unexpected crises.
Firewall Software and Hardware Firewall solutions are both designed to block unauthorized access to computers in your network. A firewall software program is installed on each individual PC it is meant to protect. To safeguard all your company’s computers, however, each one must have a software firewall installed. This can become expensive and difficult to maintain and support. But, a hardware-based firewall is easier to maintain and administer than individual software firewalls. It protect all the computers on your network.
CoreIP provides secure access to enable workers at home, at remote sites, or traveling to connect to your business safely and securely Secure storage that gives you the flexible capacity to protect and back up data, video, and images and also provide Physical protection to guard your business and your employees from theft, vandalism, and unlawful access.
Our firewall security solutions is Combined network and physical security for a more comprehensive approach that meets your needs and that allows you to add integrated protection from hackers, spam, malicious websites, or identity theft.