What is a Firewall and Can it Fully Protect Your Computer in 2019?

Eric C.
BY: Eric C.
Posted: February 6, 2019

On average, hackers infiltrate unsuspecting users’ computers every 39 seconds? A third of all Americans will be affected by this phenomenon every year, and the issue of PC hacking is only growing. As cybercrime continues to skyrocket, protecting your sensitive data, like online banking details and personal information from theft should be a top priority – and using a firewall is a first line of defense.

What is a firewall and how does it keep the cybercriminals out?

In a nutshell, firewalls are used by both individual consumers and large businesses, either as software or hardware, to scan packets of data going into and out of your computer through the internet. If the firewall filter catches any suspicious packets, they are denied access to your computer system and private network.

Firewalls are vital to stopping dangerous or fraudulent traffic from going through your network. They block specific programs from accessing the internet if the activity is deemed too risky. In 2019, every machine needs a firewall, which is why corporate IT departments typically prioritize firewall installation as a staple of corporate cybersecurity.

But even if you’re not working for a corporate entity, you should still take the necessary steps to protecting your most sensitive data.

The question is whether a firewall alone is enough to fully protect your PC.

What Kind of Attacks Do Firewalls Protect Against?

Without the supervision of a firewall, online access to your machine poses several significant threats that could compromise your personal information to cybercriminals. The issues include, but are not limited to:

  • Backdoor Access: A backdoor refers to any security holes or bugs that, when exploited, allow unauthorized control over the program. Even entire operating systems like Windows can have backdoors, and an experienced hacker knows how to take advantage of them.
  • Remote Login Hijacking: A remote desktop allows you to connect and control your computer from another location over the internet. However, hackers can hijack the login, access your machine, and steal your files.
  • Email Abuse: This type of attack targets an individual in which the perpetrator sends thousands of emails to clog the victim’s inbox. Spam e-mail is a popular While most spam is merely annoying, some may contain viruses.
  • Source Routing: When data packets are traveling through an online network, they are typically “passed along” by multiple routers before reaching its destination. Some hackers take advantage of this system by making malicious data packs look like they’re coming from a trusted source. Many firewalls disable source routing for this reason.

What Else are Firewalls Good For?

Firewall programs can sometimes be used as proxy servers. Whenever you access a web page, the proxy server receives the data first before forwarding it to your computer. This setup has a few benefits:

  • The server that holds the web page doesn’t directly interact with your machine, reducing the chances of a malicious webpage infecting your computer.
  • Your computer’s online network address is hidden from sight.
  • A version of the web page is saved in the proxy server’s cache memory, enabling faster loading if you revisit the page in the future.

On top of the proxy server, firewalls occasionally offer DMZ, or a perimeter network housing low-risk files and clients that are outside the main firewall. Since companies mainly use this feature, you most likely won’t have to worry about it.

What Are the Pros and Cons to Firewalls?

There are many advantages to running a firewall on your computer. The increased security they provide is worth the price of a few notifications and warning popups.

Pros

  • A firewall will ensure any program you run has its online access monitored and verified. Network traffic that could signal an unsecured transfer of sensitive data will be controlled through your firewall.
  • Many solutions report on the data packets that are blocked and offer pop-up notifications whenever the firewall filters out any connections. That way you are aware when something happens.
  • Some firewalls come with extra features to enhance your cybersecurity. We’ll touch more on that later.

Cons

A firewall acts as a security checkpoint for data packets entering and leaving your network. Like any security checkpoint, false positives occasionally come up. You may find that your firewall accidentally blocks a genuinely secure webpage you want to access.

This issue isn’t unique to individual users either. Internet security provider McAfee conducted a business survey that showed that a third of organizations disable firewall security features to prevent workflow interruption by false positives. Some companies disable certain features because they take up too much processing power.

How to Deal with False Positives?

If your firewall impedes your work by blocking too many packets, you should consider checking the settings and adjusting the intensity of the firewall filters. Finding a balance between security and ease of use may prove a challenge at first. Disable too many features, and you’ll be more vulnerable to attacks. Set the filter intensity too high, and you’ll run into issues with improperly blocked content.

Find and configure the settings that allow approved programs and connections. In Windows Defender’s firewall for Windows 10, for example:

  1. Open Settings.
  2. Select “Firewall & network protection” from “Windows Security.”
  3. Click “Allow an app through firewall.”
  4. On the following window, find the affected programs on the list and allow connections through either Private or Public networks.

You can decide which online connections are private or public networks when you connect to a new hotspot. In general, public networks are reserved for coffee shop Wi-Fi networks and other public areas. Private networks are for your home or work connections.

Does a Firewall Alone Offer Enough Protection?

While a firewall is an essential aspect of digital security, in many cases you will need the additional help of an antivirus. If you regularly connect to public, unsecured Wi-Fi networks, a firewall mainly serves as a preventative measure against malicious online attacks. Once a virus has managed to breach your computer, you need an antivirus to remove it.

Keep in mind that not all firewalls are created equal. The Windows 10 default firewall, Defender, is useful but somewhat barebones feature-wise. You need to ask yourself the following questions:

  • Do you want more advanced firewall protection or special functions like dual-layer virus protection?
  • How about a detailed report of what programs are attempting to access your device? These needs call for dedicated firewall solutions.
  • Do you want a free firewall or a feature-rich paid version?

There are many capable firewall options on the market, but you have to decide which one is right for you.

What Are Some Good Firewall Recommendations?

A good firewall does its job effectively, offers extra functionality, and runs without negatively impacting your system’s performance. Conveniently, some antiviruses come bundled with firewalls, covering both of your cybersecurity needs under one program.

Paid Options

1.    Bitdefender Internet Security 2019

Bitdefender is widely recommended and often cited as an excellent antivirus/firewall combination. It’s available for Windows and Mac, though the Mac version is limited. The feature set includes:

  • Protection against viruses, rootkits, and Trojans.
  • A software updater that automatically finds out-of-date programs on your computer. Dated software is a massive target for hackers after all.
  • Parental controls that filter out online content such as violence and pornography.
  • A password manager.
  • Webcam locking to prevent unauthorized access.

Pros

  • Firewall settings are configured out of the box.
  • Effective at removing threats.

Cons

  • Protection for your mobile devices is behind a paywall.
  • Notifications are intrusive. While there is a silent mode, it must be activated manually.

2.    Avira Internet Security

A budget option with some free features, Avira comes with a comprehensive firewall that covers bots and worms trying to break through your network. Other functions include:

  • A password manager.
  • Secure logins free from keyloggers and spyware.
  • A program updater.

Pros

  • Free online protection.
  • Good antivirus performance.
  • Gaming mode included.

Cons

  • Extra charge for mobile protection and parental controls.
  • The free version includes advertisements for the paid version.

3.    Intego Mac Premium

Here’s one for the Mac users. Intego keeps all its tools in a single folder for easy access. The NetBarrier function automatically detects home and public Wi-Fi networks and sets firewall settings accordingly. Other tools included are:

  • Parental controls.
  • A Washing Machine that checks for dated software.
  • VirusBarrier, a strong shield against viruses

Pros

  • Specifically designed for the MacOS environment.
  • Extra features.
  • Compatible versions for iPhone and iPad.

Cons

  • Mobile versions cost extra.
  • No protection against Windows malware. If your MacOS machine is connected to any Windows devices, there’s no guarantee those other devices will be protected.

Free Options

1.    Windows Defender Firewall

Defender should look familiar to Windows users. It’s the firewall and antivirus that comes free and pre-installed on Windows 10 machines. Overall, it’s a satisfactory solution for light users.

  • Basic configuration settings allow for controlling specific programs and managing rules for incoming and outgoing network traffic.
  • Network troubleshooter included.

Pros

  • Free for Windows 10 users.
  • Light on system resources.
  • Notifications for blocked content.

Cons

  • Somewhat barebones when it comes to features.
  • Detection rates for malware aren’t as high as other options.

2.    Comodo Free Firewall

Comodo is another free firewall solution for users looking for a bit more potency than what Windows’s default offers. Comodo features:

  • A monitor for suspicious programs and activity.
  • A sandbox mode, the main selling point in which you can visit web pages and run programs in a safe zone to test what they do before running them on your actual machine.
  • Web filtering for malicious URLs.

Pros

  • The user can make rules for individual programs and networks easily.
  • Unique sandbox mode.

Cons

  • The installer attempts to add Comodo Dragon browser. Be careful to uncheck this option when installing.

3.    GlassWire

GlassWire is the ideal firewall for users wanting information and statistics on their network activity in addition to scanning for suspicious connections.

Pros

  • Charts out your network usage, such as what programs are using the network, how much data is being used, and what suspicious actions are being done.
  • Notifications whenever a new program wants online access.
  • Beautiful user interface.

Cons

  • Complex features make it difficult for new users to grasp.
  • Webcam monitoring and data storage for older scans are offered but behind a paywall.

In 2019 Firewalls Should Not Be Considered Optional

The internet is full of risky websites, hackers, and malicious programs designed to embed themselves in your computer. That’s why installing a reliable firewall and antivirus on your system is a must.

While these programs may cause a slight lag on your computer from time to time, they keep you safe, and keep your sensitive information out of the hands of hackers and criminals.

Now that you understand how firewalls work and which ones are reliable, consider downloading a recommended antivirus with firewall protection.

About the Author

Eric C.
Eric C.

Eric is a professional copywriter with over 7 years of experience writing on marketing and tech topics. In recent years, he has focused heavily on the rapidly developing security, fintech, and cryptocurrency industries.