For those of you who frequently use computers, both for work and personal purposes, you will often hear the term ” Firewall ” as a security technology. In fact, firewalls are also the main service offered by Indonesian managed service providers related to data and network security.
However, do you understand what a firewall is and how it works?
Getting To Know Firewalls
A firewall is a security system for protecting internet networks and functions as a filter in the network. This security system will be responsible for monitoring incoming and outgoing traffic . Firewalls can be software , hardware or cloud-based but have the same main goal, namely blocking malicious traffic and allowing safe traffic to pass smoothly.
This system has been used for several decades and continues to develop to maximize its function.
Types Of Firewalls And How They Work
Launching from the compuquip.com site, the following are 5 types of firewalls and how they work:
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Packet-filtering firewalls
This is the most basic type of firewall and can be said to be the oldest compared to other types so it still has a very simple working system. This firewall will create a post on the router and perform a simple check on packets that will pass through, without opening them .
The information checked is the sender’s IP address , port number , packet type, and so on.The advantage of this type of firewall is that it does not interfere with performance because the inspection of passing packets is done simply, but in terms of security it is somewhat lacking because it is very easy to bypass. -
Circuit-level gateways
In this type, the circuit level gateway will monitor the TCP ( transmission control protocol ) handshake and also other protocol sessions in the network for packets that will pass through to ensure that the packet comes from an authorized delivery.
This firewall does not inspect packets so if it contains malware but has a proper TCP handshake , the packet will be able to pass through. That is why, this type of firewall is considered less than optimal in protecting the network unless it is combined with other IT security. -
Stateful inspection of firewalls
It could be said to be a combination of the two types of firewall above, because this firewall will check the packet type and also monitor the TCP handshake so it is safer than the previous two types. This firewall works at the network layer in the seven layer open system connection (OSI) model.
This firewall has a high level of security because it will check thoroughly. Unfortunately it is quite expensive and slows down the performance of traffic on the network. -
Application-level gateways ( proxy firewalls )
Proxy firewalls have a very high level of security and work similarly to stateful inspection firewalls . This firewall works at the application layer to filter traffic by creating additional connections.
A new connection will be created to the source of the packet traffic and then the firewall will verify the packet type and TCP handshakes . This firewall is able to analyze packets more deeply than other firewalls , making it safer. However, with the addition of new connections, performance is also slower. -
Next-gen firewalls
Next-gen Firewalls or NGFW are the most complete type of firewall currently. NGFW includes various variations of deep packet inspection (DPI) as well as other network security systems. Such as Intrusion Detection System (IDS), malware filtering , antivirus, and so on.
This firewall has multifunctional capabilities and also the best filtering accuracy. However, the price offered is quite high compared to other types of firewalls .
Firewall Managed Service From Hypernet
A firewall is a security system that must be present in a company’s IT infrastructure. However, without the use of other security systems, a firewall also does not provide maximum protection.
As reported by the searchsecurity.techtarget.com site, NGFW needs to be integrated with other security systems to provide the best benefits for the organization and the integration process is very complicated.
However, you don’t need to worry about that because Hypernet is ready to help you. Just contact us and you can #AcceptRegular regarding the security system.
