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Topic: Firewalls


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 Firewalls FAQ
Firewalls are no longer solely in the hands of those who design and implement security systems; even security-conscious end-users have them at home.
Firewall policies must be realistic and reflect the level of security in the entire network.
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.faqs.org /faqs/firewalls-faq   (14948 words)

  
 Internet Firewalls: Frequently Asked Questions
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.
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.
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.interhack.net /pubs/fwfaq   (14832 words)

  
 Distributed Firewalls
Traditional firewalls would express this by a rule that permitted SMTP (port 25) connections to the internal mail gateways; access to other internal hosts would be blocked.
A distributed firewall may choose to discard the packet, under the assumption that its legal peers know to use IPSEC; alternatively, it may instead send back a response requesting that the connection be authenticated, which in turn gives notice of the existence of the host.
Firewalls are sometimes described as incompatible with the modern network environment.
www.cs.columbia.edu /~smb/papers/distfw.html   (4164 words)

  
 firewall - a Whatis.com definition
A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks.
A firewall is often installed in a specially designated computer separate from the rest of the network so that no incoming request can get directly at private network resources.
In firefighting, a firewall is a barrier established to prevent the spread of fire.
searchsecurity.techtarget.com /sDefinition/0,,sid14_gci212125,00.html   (344 words)

  
 Building a Firewall: What you need to know before setting up a firewall, Part 2   (Site not responding. Last check: 2007-10-07)
In this, her second article on firewalls, Mandy focuses on the technologies available on the market today and some key decisions that need to be made throughout the selection process.
Firewalls should be the base component of your physical infrastructure; without them, you have nothing to provide an overall layer of security for your network.
Stateful inspection firewalls look like proxy systems from the external side because all requests appear to come from a single host (your corporate gateway), but look like packet filtering systems from the inside because internal hosts and users think they are talking directly to the external systems.
www-128.ibm.com /developerworks/security/library/s-fire2.html   (2875 words)

  
 RealNetworks RealSystem Firewall Support
The firewall's role is to ensure that all communication between an organization's network and the Internet, in both directions, conforms to the organization's security policies.
Firewalls generally fall into two categories: application-level firewalls (such as proxies) and network-level firewalls (such as packet filters).
A common configuration for network-level-filtering firewalls is to allow all connections initiated by machines inside the firewall, and restrict all connections for machines outside of the firewall.
service.real.com /firewall/firewall.html   (721 words)

  
 Port Scan Security Check - Free firewall check by Secure Design   (Site not responding. Last check: 2007-10-07)
A firewall may be a software package designed to run on your personal computer, or it may be a hardware device that can support your entire Local Area Network (LAN).
Firewalls work by inspecting each packet of data traveling over the network and makes decisions (based on rules) on wether to forward the packet, drop the packet, or send a "return to sender" packet back to the source.
Firewalls for complete LAN access must not only manage the access granted for the firewall itself, but also must manage the network traffic for all computers on the LAN.
www.sdesign.com /securitytest/firewalls.html   (374 words)

  
 NetLingo.com Dictionary of Internet Terms: Online Definitions & Text Messaging   (Site not responding. Last check: 2007-10-07)
The firewall computer is set up to monitor traffic and to keep unauthorized crackers from tampering with the system, thereby protecting a private network from a public network.
A personal firewall is software that is installed on an user's PC which controls communications to and from the user's PC.
Personal firewalls also provide a level of intrusion detection, meaning it will terminate or block connectivity when it suspects an intrusion is being attempted (by spyware, for example).
www.netlingo.com /lookup.cfm?term=firewall   (238 words)

  
 The Three Myths of Firewalls   (Site not responding. Last check: 2007-10-07)
Firewalls make the assumption that the only way in or out of a corporate network is through the firewalls; that there are no "back doors" to your network.
The more inconvenient a firewall is to your user community, the more likely someone will set up their own "back door" channel to their machine, thus bypassing your firewall.
Firewalls make the assumption that all of the bad guys are on the outside of the firewall, and everyone on the inside of the can be considered trustworthy.
web.mit.edu /kerberos/www/firewalls.html   (321 words)

  
 Understanding and Using Firewalls
These firewalls usually come with a built in hub that allows you to connect multiple computers to it in order for them all to be able to share one Internet connection.
Filtering is when a firewall examines information passing through it and determines if that information is allowed to be transmitted and received or should be discarded based on rules or filters that have been created.
If a firewall is noted as free it is important to note that their commercial equivalents will probably contain more features that may be beneficial to you.
www.bleepingcomputer.com /forums/tut60.html   (2533 words)

  
 Shields UP! -- Internet Connection Security Analysis   (Site not responding. Last check: 2007-10-07)
The firewall concept is so exactly correct that the term "firewall" has been badly abused by many weak "firewall wanna-be" products in an attempt to trade on the power of the concept.
Since the firewall software inspects each and every packet of data as it arrives at your computer — BEFORE it's seen by any other software running within your computer — the firewall has total veto power over your computer's receipt of anything from the Internet.
The firewall running on your home machine would similarly be instructed to permit connections on ports 137-139 only from your office machine's IP address.
grc.com /su-firewalls.htm   (1424 words)

  
 What is firewall? - A Word Definition From the Webopedia Computer Dictionary   (Site not responding. Last check: 2007-10-07)
Firewalls can be implemented in both hardware and software, or a combination of both.
Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.
All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.
www.webopedia.com /TERM/f/firewall.html   (539 words)

  
 SecurityFocus
This paper looks at the evolution of firewall technology towards Deep Packet Inspection, and then discusses some of the security issues with this evolving technology.
This article is the first of a two-part series that will discuss various methods to test the integrity of your firewall and IDS using low-level TCP/IP packet crafting tools and techniques.
This article examines the concept of a transparent or bridging firewall which sits hidden in-line with the network it protects.
www.securityfocus.com /firewalls   (334 words)

  
 firewalls   (Site not responding. Last check: 2007-10-07)
firewall: with a firewall you can make a rule that allows certain communications only under certain circumstances, such as 1) when a certain application is running 2) when dail-up connection is alive.
Conseal Firewall is one of the "oldies" as rule-based firewalls is concerned.
Some very fine freeware firewall add-ons are available as well, have a look at the specific item at free tools.
www.wilders.org /firewalls.htm   (1225 words)

  
 CERIAS - Firewalls
The first published description of a "modern" firewall including use of that name was in 'Practical Unix Security' written in 1990 and published in 1991.
More information about firewalls and network security can be found in the next section on mailing lists and newsgroups.
A firewall can be any of the many different methods of protecting a network from untrusted networks.
www.cerias.purdue.edu /about/history/coast_resources/firewalls   (3135 words)

  
 Firewalls
Firewalls make it possible to filter incoming and outgoing traffic that flows through your system.
A firewall can use one or more sets of “rules” to inspect the network packets as they come in or go out of your network connections and either allows the traffic through or blocks it.
The rules of a firewall can inspect one or more characteristics of the packets, including but not limited to the protocol type, the source or destination host address, and the source or destination port.
www.freebsd.org /doc/en_US.ISO8859-1/books/handbook/firewalls.html   (213 words)

  
 Howstuffworks "How Firewalls Work"
If you have a fast Internet connection into your home (either a DSL connection or a cable modem), you may have found yourself hearing about firewalls for your home network as well.
Basically, a firewall is a barrier to keep destructive forces away from your property.
Its job is similar to a physical firewall that keeps a fire from spreading from one area to the next.
www.howstuffworks.com /firewall.htm   (246 words)

  
 Firewalls Software - DownSeek.com
Kerio Personal Firewall is designed to protect any Windows PC that is connected to the Internet using DSL, cable, dial-up, ISDN, WiFi or satellite modems.
TermiNET is a Personal Firewall designed to keeps your personal data and privacy safe from Internet hackers and data thieves while connected to the Internet, browsing the web or accessing other internet.
Kool Firewall is a simple software firewall designed to monitor the traffic into and out of your system.
www.downseek.com /directory/39.asp   (1129 words)

  
 Firewalls   (Site not responding. Last check: 2007-10-07)
VisNetic Firewall is a stateful packet level firewall solution built to protect Windows based Servers through comprehensive intrusion protection.
NetWall is a highly manageable business-oriented firewall and VPN software solution to protect each IT zone according to its specific security requirements.
The CyberArmor Suite is a centrally managed distributed firewall that enables companies to extend policy-based security to remote users who access corporate networks through risky Internet and broadband always-on connections.
www.serverfiles.com /Network-security-software/Firewalls   (929 words)

  
 Home PC Firewall Guide
If a personal firewall is the sheriff, a posse is needed to help the sheriff capture the pests sent out by Internet outlaws like spyware, browser hijackers, viruses, Trojan horses, worms, phishing, spam and hybrids thereof.
After installing a firewall, use an online testing service to make sure that it is working correctly.
After you install or update a firewall, the next step is to test it to make sure that it has been configured correctly.
www.firewallguide.com   (1083 words)

  
 Firewalls - eWEEK Web Buyer's Guide
There are a wide range of firewalls on the market today, though; find the solution that is right for your business using our firewall buyer's guide.
Our Product Comparison Guide to Firewalls is a vendor-neutral report that comes in an easy to follow grid format that was researched and created by a Firewalls consultant.
Armorwall firewall software monitors all incoming network traffic and allows in only the connections that are known and trusted.
buyersguide.eweek.com /product/SearchResults.asp_Q_sitename_E_eweek_security_A_cboCategory_E_190   (663 words)

  
 NetworkingFiles.com - Software Firewalls   (Site not responding. Last check: 2007-10-07)
Firewall Pro runs seamlessly in the background and will not slow down your PC or Internet experience.
Firewall Pro also detects attempts to connect to ports used by remote-access Trojan horse programs and local programs.
Firewall Pro is extremely easy to use, and provides ready to run PC protection right out the box.
www.networkingfiles.com /Firewalls/firewalls.htm   (168 words)

  
 RealSystem Firewall Support
Firewalls create barriers in order to prevent unauthorized access to a network.
Firewalls are the security doors through which some people (i.e.
Several features of the Player will not function if your Player Preferences, Person or Network firewall are not configured correctly.
service.real.com /firewall   (179 words)

  
 ISC DHCP   (Site not responding. Last check: 2007-10-07)
The Firewalls mailing list is for discussions of Internet firewall security systems and related issues.
The Firewalls mailing list is hosted by Internet Systems Consortium.
To post a message to the firewalls mailing list, you must be a member of the list.
www.isc.org /ops/lists/firewalls   (206 words)

  
 ONLamp.com: BSD Firewalls: IPFW
It # is suggested that you set firewall_type=open in /etc/rc.conf # when first enabling this feature, then refining the firewall # rules in /etc/rc.firewall after you've tested that the new # kernel feature works properly.
I prefer this default as it gives a finer control over which packets are being accepted; I'd hate to think my kernel was accepting packets I wasn't aware of.
Since I'm only building a firewall to protect a single machine, I won't need this option.
www.onlamp.com /pub/a/bsd/2001/04/25/FreeBSD_Basics.html   (836 words)

  
 Firewalls - Reviews and free downloads at Download.com
Organize all your notes and information in one place.
Antivirus, Firewall, SpywareBlocker, ScamBlocker and Pop-Up Blocker - all in one location.
Protect your PC against hackers with this personal firewall.
www.download.com /Firewalls/3150-10435_4-0.html   (193 words)

  
 Firewalls Information
Firewall Wizards is a moderated firewall and security-related list.
This list is available in both mailing list and digest forms.
A list of reference books and other publications about firewalls is maintained on the "Publications" page.
www.cert.org /other_sources/firewalls.html   (74 words)

  
 Great Circle Associates
Great Circle's Brent Chapman is the coauthor of the critically acclaimed O'Reilly and Associates book Building Internet Firewalls, now in its second edition.
The Firewalls mailing list is the leading forum for discussions of Internet and intranet firewall security systems and related issues.
We hosted the Firewalls mailing list from its creation in September 1992 until April 1998; it is currently hosted by the Internet Systems Consortium.
www.greatcircle.com   (524 words)

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