Forum > Firewall
What are the basic types of firewalls?
johngeorge:
What is the main function of network layer?
krishna88:
--- Quote from: 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.
--- End quote ---
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
ellen123:
it was really valuable. thanks a lot
Akshay_M:
--- Quote from: 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.
--- End quote ---
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
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