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Topic Summary

Posted by: keran collier
« on: 03. July 2023., 12:00:49 »

There are several basic types of firewalls commonly used to protect computer networks and systems from unauthorized access and potential threats. Here are the most common types:

Packet Filtering Firewall: Packet filtering firewalls examine packets of data as they pass through the network. They compare the characteristics of each packet against a set of predetermined rules, such as source and destination IP addresses, port numbers, and protocols. Based on these rules, the firewall either allows or blocks the packets. Packet filtering firewalls can be implemented in hardware or software.

Stateful Inspection Firewall: Stateful inspection firewalls operate at the network layer (Layer 3) of the OSI model. In addition to examining individual packets, they maintain context and awareness of the state of network connections. By tracking the state of connections, these firewalls can make more intelligent decisions about which packets to allow or block. Stateful inspection firewalls provide improved security compared to packet filtering firewalls.

Proxy Firewall: A proxy firewall acts as an intermediary between the internal network and external systems. Instead of allowing direct connections between internal and external networks, all requests from internal systems are forwarded to the proxy firewall, which then initiates and manages the connection with the external systems on behalf of the internal systems. Proxy firewalls can provide additional security features, such as content filtering and caching, but may introduce additional latency due to the proxying process.

Next-Generation Firewall (NGFW): Next-generation firewalls combine traditional firewall functionalities with additional advanced features. These features can include deep packet inspection, intrusion prevention systems (IPS), application awareness and control, user identity management, SSL and SSH inspection, and more. NGFWs offer enhanced security and granular control over network traffic.

Application-Level Gateway (Proxy Firewall): An application-level gateway, also known as an application proxy or proxy firewall, operates at the application layer (Layer 7) of the OSI model. It acts as an intermediary for specific applications or protocols, inspecting the application-level data and making security decisions based on that information. Application-level gateways offer strong security but may introduce more complexity and potential performance impacts due to the deep inspection process.

Virtual Private Network (VPN) Firewall: A VPN firewall combines the functionalities of a firewall and a virtual private network. It provides secure remote access to internal networks by establishing encrypted tunnels between remote clients and the network. VPN firewalls authenticate remote users and encrypt their data, ensuring secure communication over the public internet.

Each type of firewall has its own strengths and weaknesses, and the choice of firewall depends on the specific security requirements and network environment of an organization. Often, a combination of different firewalls is used to provide layered security and defense-in-depth strategies.
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« on: 24. November 2022., 10:09:10 »

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Posted by: Akshay_M
« on: 23. October 2019., 17:47:11 »

Conceptually, there are three types of firewalls:

Network layer
Application layer
Hybrids
They are not as different as you might think, and latest technologies are blurring the distinction to the point where it's no longer clear if either one is ``better'' or ``worse.'' As always, you need to be careful to pick the type that meets your needs.

Which is which depends on what mechanisms the firewall uses to pass traffic from one security zone to another. The International Standards Organization (ISO) Open Systems Interconnect (OSI) model for networking defines seven layers, where each layer provides services that ``higher-level'' layers depend on. In order from the bottom, these layers are physical, data link, network, transport, session, presentation, application.

The important thing to recognize is that the lower-level the forwarding mechanism, the less examination the firewall can perform. Generally speaking, lower-level firewalls are faster, but are easier to fool into doing the wrong thing.

These days, most firewalls fall into the ``hybrid'' category, which do network filtering as well as some amount of application inspection. The amount changes depending on the vendor, product, protocol and version, so some level of digging and/or testing is often necessary.

There are different types of firewalls depending on where the communication is taking place, where the communication is intercepted and the state that is being traced.

Network layer Firewall
Application layer firewall
Proxy server
Network address translation


Regards,
Akshay
Posted by: ellen123
« on: 21. February 2018., 04:34:00 »

it was really valuable. thanks a lot
Posted by: krishna88
« on: 01. February 2018., 08:42:38 »

Conceptually, there are three types of firewalls:

Network layer
Application layer
Hybrids
They are not as different as you might think, and latest technologies are blurring the distinction to the point where it's no longer clear if either one is ``better'' or ``worse.'' As always, you need to be careful to pick the type that meets your needs.

Which is which depends on what mechanisms the firewall uses to pass traffic from one security zone to another. The International Standards Organization (ISO) Open Systems Interconnect (OSI) model for networking defines seven layers, where each layer provides services that ``higher-level'' layers depend on. In order from the bottom, these layers are physical, data link, network, transport, session, presentation, application.

The important thing to recognize is that the lower-level the forwarding mechanism, the less examination the firewall can perform. Generally speaking, lower-level firewalls are faster, but are easier to fool into doing the wrong thing.

These days, most firewalls fall into the ``hybrid'' category, which do network filtering as well as some amount of application inspection. The amount changes depending on the vendor, product, protocol and version, so some level of digging and/or testing is often necessary.

Hi @Rosie667,

Thanks for the information about basic types of firewalls?  :up:

Here is the link for more information - http://searchsecurity.techtarget.com/feature/The-five-different-types-of-firewalls

Posted by: johngeorge
« on: 11. March 2013., 18:08:43 »

What is the main function of network layer?
Posted by: jasonmilsont
« on: 17. July 2012., 18:43:34 »

This is when you set up the application program onto a individual pc and set up it so that it functions as a entry into your system. For this settings to perform the application pc must be between the system and the world wide web and it must be fixed with two system cards.
Posted by: barrlowgeorge
« on: 06. February 2012., 06:16:41 »

Following are the basic types of firewalls:
1.Network layer : make their decisions based on the source address, destination address and ports in individual IP packets.

2.Application layer : host running proxy servers.Do not permits traffics directly between networks.

3.Proxy : traffic does not flow through a proxy.  Computers establish a connection to the proxy,  serving as an intermediary.

4.UTM(UNIFIED THREAT MANAGEMENT) : These devices permit integration, convenience and protection from threats and are especially valuable to small and medium-sized businesses.
Posted by: Blake_Brice
« on: 11. January 2012., 07:51:40 »

Conceptually, there are two types of firewalls:

1.
    Network layer
2.
    Application layer

They are not as different as you might think, and latest technologies are blurring the distinction to the point where it's no longer clear if either one is ``better'' or ``worse.'' As always, you need to be careful to pick the type that meets your needs.

Which is which depends on what mechanisms the firewall uses to pass traffic from one security zone to another. The International Standards Organization (ISO) Open Systems Interconnect (OSI) model for networking defines seven layers, where each layer provides services that ``higher-level'' layers depend on. In order from the bottom, these layers are physical, data link, network, transport, session, presentation, application.
Posted by: ronyyroyals
« on: 30. April 2011., 22:51:12 »

 There are two types of firewalls:
1) Network layer;
2) Application layer.
which implement various types of security policies. The firewall itself is immune to penetration to it's security.
Posted by: Rosie667
« on: 15. April 2011., 07:33:18 »

Conceptually, there are three types of firewalls:

Network layer
Application layer
Hybrids
They are not as different as you might think, and latest technologies are blurring the distinction to the point where it's no longer clear if either one is ``better'' or ``worse.'' As always, you need to be careful to pick the type that meets your needs.

Which is which depends on what mechanisms the firewall uses to pass traffic from one security zone to another. The International Standards Organization (ISO) Open Systems Interconnect (OSI) model for networking defines seven layers, where each layer provides services that ``higher-level'' layers depend on. In order from the bottom, these layers are physical, data link, network, transport, session, presentation, application.

The important thing to recognize is that the lower-level the forwarding mechanism, the less examination the firewall can perform. Generally speaking, lower-level firewalls are faster, but are easier to fool into doing the wrong thing.

These days, most firewalls fall into the ``hybrid'' category, which do network filtering as well as some amount of application inspection. The amount changes depending on the vendor, product, protocol and version, so some level of digging and/or testing is often necessary.
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