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Topic: Network layer firewalls

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	Network layer firewall - Wikipedia, the free encyclopedia
		In computer networks, a network layer firewall works as a packet filter by deciding what packets will pass the firewall according to rules defined by the administrator.
		Network layer firewalls generally fall into two sub-categories, stateful and non-stateful.
		Stateful firewalls hold some information on the state of connections (for example: established or not, initiation, handshaking, data or breaking down the connection) as part of their rules (e.g.
	en.wikipedia.org /wiki/Network_layer_firewall (215 words)

	Firewall article - Firewall fire Firewalls construction Firewalls computer networking Network - What-Means.com (Site not responding. Last check: 2007-10-08)
		Network layer firewalls operate at a (relatively low) level of the TCP/IP protocol stack as IP-packet filters, not allowing packets to pass through the firewall unless they match the rules.
		Application-layer firewalls work on the application level of the TCP/IP stack (i.e., all browser traffic, or all telnet or ftp traffic), and may intercept all packets traveling to or from an application.
		Firewalls often have network address translation functionality, and the hosts protected behind a firewall commonly use so-called "private address space", as defined in RFC 1918.
	www.what-means.com /encyclopedia/Firewall (699 words)

	Application layer firewall - Wikipedia, the free encyclopedia
		In computer networking, an application layer firewall is a firewall operating at the application layer of a protocol stack.
		As it works on the application layer, it may inspect the contents of the traffic, blocking what the firewall administrator views as inappropriate content, such as certain websites, viruses, attempts to exploit known logical flaws in client software, and so forth.
		An application layer firewall does not route traffic on the network layer.
	en.wikipedia.org /wiki/Application_layer_firewall (142 words)

	What are the basic types of firewalls?
		In a screened subnet firewall, access to and from a whole network is controlled by means of a router operating at a network layer.
		Application layer firewalls can be used as network address translators, since traffic goes in one ``side'' and out the other, after having passed through an application that effectively masks the origin of the initiating connection.
		Firewalls with end-to-end encryption can be used by organizations with multiple points of Internet connectivity to use the Internet as a ``private backbone'' without worrying about their data or passwords being sniffed.
	www.vesaria.com /Firewall/FAQ/sec19.php (769 words)

	Network layer firewalls
		A network layer firewall works as a packet filter[?] by deciding what packets will pass the firewall according to rules defined by the administrator.
		Network layer firewalls tend to be very fast and transparent to users.
		Network layer firewalls can be implemented with a normal computer running an operating system which supports packet filtering and routing.
	www.fastload.org /ne/Network_layer_firewalls.html (205 words)

	Network layer firewalls (Site not responding. Last check: 2007-10-08)
		A network layer firewall works as a packet filter by deciding what packets will pass the firewall according to defined by the administrator.
		Network layer firewalls generally fall into two stateful and non-stateful.
		Stateful firewalls hold some information on state of connections (for example: established or initiation handshaking data or breaking down the as part of their rules (e.g.
	www.freeglossary.com /Network_layer_firewalls (571 words)

	Firewalls FAQ
		Although firewalls can help to mitigate some of the risks present on an Internet without authentication or encryption, there are really two classes of problems here: integrity and privacy of the information flowing between hosts and the limits placed on what kinds of connectivity is allowed between different networks.
		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.
		In the case of firewalls, a data driven attack is a concern since it may get through the firewall in data form and launch an attack against a system behind the firewall.
	www.linux.opennet.ru /docs/FAQ/security/firewalls-faq.html (15066 words)

	Firewalls FAQ
		A firewall is a system or group of systems that enforces an access control policy between two networks.
		Firewall policies must be realistic and reflect the level of security in the entire network.
		Network-Layer Firewall A firewall in which traffic is examined at the network protocol packet layer.
	www.faqs.org /faqs/firewalls-faq (14948 words)

	Network Firewalls (Site not responding. Last check: 2007-10-08)
		A firewall is often installed away from the rest of the network so that no incoming request can get directly at private network resources.
		Network layer: make their decisions based on the source, destination addresses and ports in individual IP packets.
		Application layer: typically are hosts running proxy servers, which permit no traffic directly between networks, and which perform elaborate logging and auditing of traffic passing through them.
	javvin.biz /networksecurity/firewall.html (499 words)

	Application layer firewalls (Site not responding. Last check: 2007-10-08)
		An Application layer firewall as the name suggests is a firewall operating at the application layer of a protocol stack.
		As it works on the layer it may also inspect the contents the traffic blocking what the firewall administrator as inappropriate content such as certain websites known attempts to exploit logical flaws in software and so forth.
		All traffic stops at the firewall the firewall may initiate its own connections it finds that the traffic is ok to the rules.
	www.freeglossary.com /Application_layer_firewalls (201 words)

	Firewall - Spamfo
		In computing, a firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy, analogous to the function of firewalls in building construction.
		The ultimate goal is to provide controlled connectivity between zones of differing trust levels through the enforcement of a security policy and connectivity model based on the least privilege principle.
		Today network firewalls are built into most computer operating system and network appliances.
	www.spamfo.co.uk /firewall (525 words)

	firewall_protection : What are the basic types of firewalls? (Site not responding. Last check: 2007-10-08)
		One thing that's an important distinction about many network layer firewalls is that they route traffic directly through them, so to use one you either need to have a validly assigned IP address block or to use a ``private internet'' address block.
		Early application layer firewalls are not particularly transparent to end users and may require some training.
		Secondly I want to know the cases that happened before the development of firewalls and what led your guys to develop firewalls.
	free-blog-site.com /firewall_protection/archive/2004/07/14/13844.aspx (774 words)

	Internet Firewalls: Frequently Asked Questions
		A firewall is a system or group of systems that enforces an access control policy between two or more networks.
		Firewalls provide an important logging and auditing function; often they provide summaries to the administrator about what kinds and amount of traffic passed through it, how many attempts there were to break into it, etc.
		Example Network layer firewall: In Figure 2, a network layer firewall called a ``screened subnet firewall'' is represented.
	www.interhack.net /pubs/fwfaq (14832 words)

	The evolution of application layer firewalls
		The issue with these application-layer firewalls seems to be whether they should be placed at all Internet gateways and evaluating whether they are worth the cost.
		Deep packet inspection firewalls are the latest stage in the evolution of firewall technology, says Richard Steinnon, an analyst for Gartner credited with coining the term deep packet inspection.
		The firewall assembles packets into streams that represent sessions and analyzes whether the behavior of the session is atypical of appropriate use of the application.
	www.nwfusion.com /news/2004/0202specialfocus.html (1496 words)

	Firewall Approach to Internet Security:Firewall Components (Site not responding. Last check: 2007-10-08)
		As was mentioned above firewall must inspect all the packets that come to and leave the Local Network and filter out those packets that do not conform to the Security Policy adopted for the Local Network.
		But packet inspection is most commonly implemented at Application layer by Application layer firewalls and at Network layer by Network layer firewalls.
		When talking about TCP/IP protocol suite the Application layer firewalls are commonly called Application Gateways or Proxies(further Proxies) and Network layer firewalls Filtering Routers or Screening Routers(further Filtering Routers).
	www2.rad.com /networks/1997/firewall/FwTutorial/link2.htm (124 words)

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