What are the risks of NOT using a firewall (home computer)?


It sounds like the question is about a host-based firewall on an Ubuntu PC.

IF the machine never leaves the NAT-based network (ie, it is not a laptop that you take to coffee shops and use on free wifi networks),

AND there are no ports open on your router that could be mapped to your Ubuntu machine,

AND your router doesn't have any features which helpfully open ports for you based on things that happen on your network (UPnP)

AND you will never have any other devices on your local network that might be compromised and attack your Ubuntu box,

THEN your system is probably secure without a host-based firewall.

However, if some of these things aren't true, or might become untrue in the future, a host-based firewall is a really good idea. Given the potential benefits and the limited drawbacks, why not enable...

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What is a firewall?

A firewall is a software program or piece of hardware that helps screen out hackers, viruses, and worms that try to reach your computer over the Internet. If you can’t start Windows Firewall or you are getting an error, use our free tool to diagnose and fix problems.

If you use a computer at home, the most effective and important first step you can take to help protect your computer is to turn on a firewall.

Windows 8, Windows 7, Windows Vista, and Windows XP SP2 or higher have a firewall built-in and turned on by default. (Note: Support for Windows XP ended in April 2014.)

If you have more than one computer connected in the home, or if you have a small-office network, it is important to protect every computer. You should have a hardware firewall (such as a router) to protect your network, but you should also use a software firewall on each computer to help prevent the spread of a virus in your network if one of the computers...

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A firewall is a security device that can be a software program or a dedicated network appliance. The main purpose of a firewall is to separate a secure area from a less secure area and to control communications between the two. Firewalls can perform a variety of other functions, but are chiefly responsible for controlling inbound and outbound communications on anything from a single machine to an entire network.

Software Firewalls

Software firewalls, also sometimes called personal firewalls, are designed to run on a single computer. These are most commonly used on home or small office computers that have broadband access, which tend to be left on all the time. A software firewall prevents unwanted access to the computer over a network connection by identifying and preventing communication over risky ports. Computers communicate over many different recognized ports, and the firewall will tend to permit these without prompting or alerting the user. For example,...

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You probably don’t realize it, but even your home cable or DSL router uses a firewall. Firewalls are one of the most integral parts of security for any network. Whether you have a small or large network, you need a firewall. Firewalls can be software such as the Windows firewall for the operating system or hardware such as filtering set on a router. To better secure your network, it’s best to understand the functionality of a firewall in networking and computing.

Understand firewalls from beginning to advanced using Vyatta at Udemy.com

What Does a Firewall Do?

Firewalls and security are a technical topic that even some experts have a hard time grasping. That doesn’t mean you can’t work with a firewall as a user and understand security basics. Firewalls and antivirus work hand-in-hand to protect your computer and other computers on the network. Antivirus detects any malware running on the computer, and a firewall blocks malicious connections.


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Offering the HTTP service means that any vulnerability in that service becomes an entry point for attackers. So be sure to manage this service with all due diligence: apply security fixes published by the vendor, as promptly as possible. This is for both the HTTP server software itself (say, Apache) and the "site code" (a hole in the PHP code is still a hole). Apart from that, this server won't add much to your (in)security, on the technical side of things.

However, a publicly available HTTP server implies higher exposure. Most people evade trouble not by running fully patched software, but by being commoners. People from home doing Web surfing like normal people. Uninteresting schmucks. There are so many of those, perhaps billions, that nobody really gets motivated into hacking into their machines. Sure, there is a lot of automatic hacking going on; those botnets won't feed themselves ! But no real threat from a motivated, intelligent attacker. By running a Web server, you...

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This document provides home users an overview of the security risks and countermeasures associated with Internet connectivity, especially in the context of "always-on" or broadband access services (such as cable modems and DSL). However, much of the content is also relevant to traditional dial-up users (users who connect to the Internet using a modem).

Table of Contents


Computer securityWhat is computer security?Why should I care about computer security?Who would want to break into my computer at home?How easy is it to break into my computer?TechnologyWhat does "broadband" mean?What is cable modem access?What is DSL access?How are broadband services different from traditional dial-up services?How is broadband access different from the network I use at work?What is a protocol?What is IP?What is an IP address?What are static and dynamic addressing?What is NAT?What are TCP and UDP ports?What is a firewall?What does antivirus software do?Computer...
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Secure your home computer or network with a 24-7 connection by installing a Linux firewall. Part one of this three part series gets you started doing just that.

Secure your home computer or network with a 24-7 connection by installing a Linux firewall. Part one of this three part series gets you started doing just that.

Home users didn't use to worry if their computer systems were vulnerable to a hacker attack. And truth is, most dial-up connections are done from computers that are not vulnerable. Typical dial-up connections are dynamically assigned a new IP address each time the user connects. Since the connections are of a relatively short term a few hours at most and because the IP address always changes, it is rather difficult to crack through such a connection. Therefore, this kind of home dialup connection is generally safe.

Has that changed now with broadband 24-7 home connections through cable modems, Digital...

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A firewall is a means of controlling network access to one or more computers. The Internet is really one large network, which includes your computer. A firewall protects your computer by acting as a gate through which both all data must pass. By blocking certain kinds of traffic, the firewall protects your computer or network from unauthorized users and safeguards your data from attack. Setting up a firewall has distinct advantages and disadvantages.

A router is a hardware firewall.

Information is vulnerable on disk and in transit. Networks break down data into units called "network packets." "Packet sniffers" can record them. By spoofing IP addresses, attackers intercept traffic, sending you fake data and commands.

Firewalls use a variety of techniques to protect against attacks. As proxy servers, firewalls mask your IP address and limit traffic types. External computers communicate with them, instead. As circuit-level gateways, firewalls limit connections to...

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ITE v6 Final Exam 2016

In Cisco exam system, there are two types of ITE final exam. We are helping you to collect both exam form to show you on this page. Each exam are almost 60 questions. While you take exam online with Cisco, you will meet 60 questions with duration 1 hours to 2 hours depend on your instructor activate.

To pass final exam, you should review all these question. We provide you accurate answer 100%.

What is the purpose of RAID adapters?

to allow older PCI technology expansion slots to be used to provide enhanced audio and graphic capabilities to connect multiple storage devices for redundancy or speed to connect peripheral devices to a PC to improve performance

Which type of interface should a customer choose if connecting a single cable from a Microsoft Windows computer to output both audio and video to a high definition television?

Which type of input device can identify users based on their voice?

digitizer KVM...
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SecPoint Products / Protector / Protector Questions FAQ Part3 /

Before we talk about the weaknesses of firewalls it is crucial to know and see to understand how a firewall is setup and how it actually works. Simply put, a firewall is either a software or a hardware based security system for networks, that is tasked with regulating the flow of incoming and outgoing network traffic. In order to decide which data packets should be allowed through and which should be prevented, the firewall carries out a proper analysis that is based upon an applied set of rules. Basically, the definition of a firewall can be stated in a variety of different terms, depending primarily upon your level of understanding of computer networks. Primarily however, a firewall creates a sort of a barrier between a network of computers that can be trusted, as well as an external network, such as the internet, which cannot be trusted. In case somebody tries to send in data packets that are infected with...

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I will tell you 0 steps, but an advice: Don't do it.

Windows 10 by default comes with an Antivirus and Firewall software. You do not need to install anything else to further secure your system as with each software you install on your computer, you are just installing more possible bugs and security issues into your system. Additionally, I must add that any firewall software that does not offer a proper Intrusion Detection System (most softwares don't) is not worth a single penny.

As for creating your own firewall software, this is even a worse idea than installing an existing solution as I doubt that even if you are a Software Engineer that you’d have the required expertise to create such a piece of software. I came to this conclusion as someone with expertise wouldn't need to ask this question. Thus, the risk of bugs and security risks will solely grow.

Now is there a way to further secure your Windows with an additional firewall to the already installed...

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By Tony Northrup

On This Page

The Nature of Today’s Attackers
The Firewall to the Rescue
Types of Firewalls
How a Firewall Works
Host-Based Firewalls
Network Firewalls
Firewalls for Small Offices and Home Offices
Firewalls for Enterprises
Firewall Products


Firewalls are a key part of keeping networked computers safe and secure. All computers deserve the protection of a firewall, whether it’s the thousands of servers and desktops that compose the network of a Fortune 500 company, a traveling salesperson’s laptop connecting to the wireless network of a coffee shop, or your grandmother’s new PC with a dial-up connection to the Internet.

This article covers the design, deployment, and use of both network and host-based firewalls (also called personal firewalls). Although home users have traditionally used only host-based...

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If you have been using the Internet for any length of time, and especially if you work at a larger company and browse the Web while you are at work, you have probably heard the term Firewall used. For example, you often hear people in companies say things like, "I can't use that site because they won't let it through the firewall."
If you have a fast Internet connection into your home, you may have found yourself hearing about firewalls for your home network as well. It turns out that a small home network has many of the same security issues that a large corporate network does. You can use a firewall to protect your home network and family from offensive Web sites and potential hackers.
Basically, a firewall is a barrier to keep destructive forces away from your property. In fact, that's why it???s called a firewall. Its job is similar to a physical firewall that keeps a fire from spreading from one area to the next.
A security device built into many...

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There are many security risks of particular concern to the home user. Lisa Yeo helps you define your needs and then select and maintain a personal firewall product that is right for you.

In the early days of cable Internet at home, people discovered they could click on Network Neighborhood and view other computers in the same cable segment. If those other computers had resources shared, you could access them. Plunking in a personal firewall to block the specific connections used by Windows shares stops your neighbors from accessing your computer this way. A personal firewall can be a tool to protect your own privacy.

Here we discuss other risks that are of particular concern to the home user. Then we discuss the points you'll want to keep in mind as you select the personal firewall that is right for you.

Identifying Risks

Home users share the same risks as corporate users. You might not think that you make an attractive target. After all, what juicy...

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Part of Firewalls: A False Sense of Security

Firewalls are necessary but like other security measures have weaknesses and shortcomings in their barriers.

here are a few deficiencies in your personal firewall:

Problematic software: This is one of the most common ways of sneaking past a firewall. Like all security software, firewalls have weaknesses and vulnerabilities. These are what is targeted when a virus is written, or when a hacker wants to break into your system.

Sometimes these attacks are called Zero-Day exploits. What is a Zero-Day exploit?. These exploits have never been seen before, hence they're difficult to defend against. The vulnerabilities in the software are not known to the user or the developer right away, leaving a small window of time for the weaknesses to be exploited before any attempt at applying the software patch can take place to fix the problem.

Disabled Firewall: As if it weren't bad enough that some malware could...

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Firewalls, Security, and Risk Management

We believe it's important to discuss the topics of security and risk management, as they relate to firewalls, before we can jump into the process of troubleshooting. After all, your firewall problem might be something fundamental, as opposed to just a misconfiguration that's affecting your security in a very negative way. We strongly believe that you cannot manage a firewall without first thoroughly understanding risk management and computer security.

To begin, it's important to define what security is. Security is defined in some places as "freedom from risk." Some people would perceive this to mean "absence of risk," but we prefer to see it as freedom from its negative effects. The risk might still exist, but you are free to act (or not act) in spite of that risk. In some cases, you can even eliminate specific risks; in others you cannot but must still act with that risk looming, if you will, over your head. The bottom line...

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