With the arrival of the coronavirus pandemic, companies needed to adapt their workflows, allowing their employees to work from home. In this context, if they wanted secure communication between employees and the company , implementing a VPN became essential. This fact alone suggests that VPNs are fundamental tools for corporate and personal security, far from being a mere technological myth.
VPNs are not only designed to protect communication between two points by encrypting all content from sender to receiver , but they also prevent your ISP (Internet Service Provider) from tracking the websites you visit. However, it's vital to understand that not all solutions are created equal. Before subscribing to a service, it's essential to analyze its protocols, jurisdiction, and specific use cases.
What is a VPN and how does it fundamentally work?
The acronym VPN stands for Virtual Private Network . It is an encrypted connection established between your device and the servers of the service provider. Simply put, a VPN creates a secure "tunnel" where data travels encrypted, preventing any external entity, including your ISP or a hacker on a public network, from decrypting the information.
A VPN server acts as an intermediary, requesting web page content on our behalf using a different IP address . This effectively masks our actual physical location. There are two main categories: paid VPNs (like NordVPN or Surfshark) and free VPNs. Paid VPNs typically guarantee that no activity logs are kept, while free VPNs often sell user browsing data to fund their infrastructure, thus negating the anonymity the user believes they have gained.
It's important to distinguish between a VPN and private browsing (incognito mode). While incognito mode prevents your local browser from saving history and cookies, this information remains visible to your ISP and the websites you visit. A VPN, on the other hand, hides your activity from your ISP and masks your identity by encrypting your traffic.
How a VPN technically works
When we browse without protection, our internet provider generates a detailed record of our activity. This information is valuable for marketing and can be obtained by law enforcement through court orders. By activating a VPN, requests are sent encrypted directly to the VPN server , which then redirects them to their final destination. The server receives the response and returns it to the user, maintaining the encrypted tunnel at all times.
To prevent data persistence, the most secure providers use servers with RAM disks . Unlike traditional hard drives, RAM is volatile; this means that all data is automatically erased every time the server restarts or the user logs off, ensuring that no physical trace of user activity remains.
Historically, VPN technology evolved from US Department of Defense projects in the 60s with ARPANET, through the creation of protocols like IPsec and PPTP in the 90s. What began as an exclusively corporate tool for connecting remote locations has become democratized for the end consumer seeking privacy and geographic freedom.
What is a VPN for: Real uses and benefits
Secure connections and end-to-end encryption
The primary mission is to provide secure communications . By encrypting the connection from computer to server, it prevents third parties from intercepting passwords, banking data, or sensitive information, which is especially critical in environments where network security is uncertain.
Circumventing geographical restrictions in streaming and sports
Thanks to the ability to select servers in different countries, we can bypass the geographical restrictions of platforms like Netflix, Hulu, or YouTube. This allows access to content catalogs exclusive to regions like the United States or Japan. It's also the ideal tool for accessing foreign sports platforms that broadcast events (like Formula 1 or football leagues) for free or through public channels in other countries.
Saving money on online shopping and travel
Many e-commerce websites and airlines use cookies and IP addresses to apply dynamic pricing based on location or browsing history. By using a VPN and clearing cookies, we can appear to the website as a new user or from a country with lower prices, obtaining fairer fares.
Protection on public Wi-Fi networks
Open networks in cafes or airports are vulnerable to interception attacks. A VPN ensures that all outgoing information is encrypted , making the data unreadable to any attacker "listening" to the local network traffic.
Access to blocked websites and P2P downloads
In highly censored regimes, VPNs are the only way to access banned social media or news outlets. Furthermore, in countries where torrenting is strictly monitored, VPNs conceal download activity from ISPs , preventing legal notifications or penalties.
How to choose the best VPN: Critical security factors
In a saturated market, it's easy to confuse marketing with actual security. To choose a reliable provider, you should analyze the following key factors:
Encryption and next-generation protocols
Security is the most important feature. You should choose providers that use 256-bit AES encryption , the standard used by governments and banks. Regarding protocols, the most recommended ones currently are:
- WireGuard: The most modern one prioritizes speed and energy efficiency.
- OpenVPN: The gold standard in terms of balance between security and stability.
- IKEv2/IPsec: Excellent for mobile users due to its fast reconnection capability.
No-Logs Policy
It is essential that the company has a transparent , zero-logs policy , preferably audited by independent third parties. This ensures that no credentials, browsing history, or real IP addresses are stored, protecting you even against legal requests.
Jurisdiction and Privacy Laws
The company's legal location is key. It is recommended to avoid providers based in countries belonging to the "Five Eyes" surveillance alliance (USA, UK, Canada, Australia, and New Zealand), as these nations can legally compel companies to hand over user data.
Advanced Security Features
- Termination Switch (Kill Switch): It instantly cuts off your internet connection if the VPN drops, preventing your real IP address from being exposed for even a second.
- DNS and IP Leak Protection: It ensures that domain name requests do not leak outside the encrypted tunnel.
- Multi-Factor Authentication (MFA): Add an extra layer of security to your login using physical keys or mobile apps.
Performance, Compatibility and Cost
Analyze the connection speed and the number of available servers. A diverse network reduces congestion and improves geo-unblocking capabilities. Also, verify that it's compatible with all your devices (Windows, macOS, Linux, Android, iOS, Fire TV) and allows a reasonable number of simultaneous connections.
Avoid free VPNs if you're looking for real privacy. Premium services rely on subscriptions, while free ones typically sell user data to third parties.
How to check if your VPN is really secure (Tests and reviews)
It's not enough for the application to say "Connected." A series of diagnostic tests must be performed to confirm that there are no data leaks.
Quick verification checklist
- The IP address changes when the VPN is activated.
- DNS servers change and do not belong to the ISP.
- There are no WebRTC leaks.
- Speed ​​remains at reasonable levels (a drop of 10-50% is normal).
- Geographically restricted content becomes accessible.
- The software does not exhibit suspicious behavior or malware.
Detailed filtration tests
1. DNS leak test: Visit a DNS test site. If you still see your ISP's servers after connecting to the VPN, you have a DNS leak, which means your ISP knows which websites you visit even though your IP address is hidden.
2. IP leak test: Compare your IP address before and after the connection. If your original IP address appears while the VPN is active, you may have "split tunneling" enabled incorrectly or there may be protocol errors.
3. WebRTC Leakage Test: WebRTC is a video calling technology that sometimes bypasses the VPN tunnel. Use a WebRTC test; if your real IP address is visible, you should disable WebRTC in your browser settings or use a VPN that automatically blocks it.
Resolution of common problems
If the tests fail, try the following steps in order: change servers, update the application, restart your device, or change the protocol (for example, switch from OpenVPN to WireGuard). If the connection is unstable, check that your antivirus or firewall isn't blocking encrypted traffic.
Types of VPN implementation
Depending on the need, there are different ways to deploy a VPN:
- Remote Access VPN: The most common for individual users; it connects the device to a remote server.
- Site-to-Site VPN: Used by large companies to securely connect two geographically separate LAN networks.
- Client-to-Provider VPN: The user connects directly through the VPN provider, eliminating the tunneling phase over the regular ISP.
As for installation, you can choose a standalone client (full software), a browser extension (faster but only protects browser traffic), or a VPN router , which protects all devices in the house, including Smart TVs and consoles that do not support VPN apps.
It's crucial to remember that a VPN is not a substitute for antivirus software. While it protects your identity and traffic, it won't protect you against Trojans, phishing, or malware that you knowingly download. Maximum security is achieved by combining a premium VPN with comprehensive security software and using common sense while browsing.
For the most comprehensive protection, look for services that integrate additional tools such as ad blockers, tracker and cookie blockers, Dark Web monitors, and virtual email generators. The final choice should be based on a balanced assessment of the provider's reputation, pricing transparency, and the robustness of its technical infrastructure.
