Types Of Firewall Security

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Types Of Firewall Security
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What Is Firewall?
The word firewall means a network device that is
used to block certain types of network traffic.
Basically, firewall forms a barrier between a
trusted and an untrusted network.
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Types Of Firewall
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Packet Filtering Firewall

• In this type of firewall, there are security
  rules that block traffic based on IP address and
  IP protocol.
• Filtering Rules are based on information
  contained in a network.
• Source IP address
• Destination IP address
• Source and destination transport level address
• IP protocol field
• Interface

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Stateful firewall

• A Stateful packet firewall tightens up the rules
  for TCP traffic by creating a directory of
  outound TCP connections.
• There is an entry for each established
  connection.
• This is like a packet filtering firewall, however
  it is more astute about monitoring dynamic
  associations.

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Deep packet inspection firewall
Deep packet inspection is a form of computer
network packet filtering that examines the data
part of a packet as it passes an inspection
point, searching for protocol non-compliance,
viruses, spam, intrusions, or defined criteria to
decide whether the packet may pass or if it needs
to be routed to a different destination, or, for
the purpose of collecting statistical information
that functions at the Application layer of the
OSI model.
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Application-aware firewall

• Similar to deep packet inspection, except that
  the firewall understands certain protocols and
  can parse them, so that signatures or rules can
  specifically address certain fields in the
  protocol. 
• The flexibility of this approach to computer
  firewall protection is great and permits the
  signatures or rules to be both specific and
  comprehensive.

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Application Proxy Firewall

• An application proxy goes about as a go-between
  for certain application activity, (for example,
  HTTP, or web, movement), catching all
  solicitations and approving them before passing
  them along.
• For an application proxy firewall to be viable as
  PC firewall insurance, it must have the capacity
  to comprehend the protocol totally and to uphold
  hindering on infringement of the protocol.

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Contact Us
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