Is a VPN Really Necessary? 5 Truths Marketing Won't Tell You

Recently, a friend told me he was worried because he didn’t use a VPN while doing banking transactions on public Wi-Fi. This concern is a reflection of the “security everywhere, anytime” perception ingrained in our minds by VPN marketing campaigns. However, I’ve been working in systems and networking for 20 years, and what I’ve seen is significant misinformation about what a VPN is and what it does.

Marketing often presents a VPN as a kind of magical security shield, promising “complete anonymity” and “absolute data privacy.” In this post, I’ll go beyond these promises to explain the real functions of a VPN, its impact on performance, modern alternatives, and when it’s truly necessary, based on my own experiences.

What Does a VPN Really Do? What Are Its Core Functions?

VPN, or Virtual Private Network, in its simplest definition, is a technology that secures data communication by creating an encrypted tunnel between two network points. Through this tunnel, your internet traffic is encrypted and routed through a designated server, as if you were physically on that network. My observation is that it’s primarily used in three main scenarios:

First, in the corporate world, it’s used for remote access. When I was working in a manufacturing company’s ERP, I would use the company VPN when I needed to connect to the database or internal network services remotely. This was one of the most common ways to securely access the company’s internal resources over the internet.

Second, it’s used to protect traffic on untrusted networks like public Wi-Fi. When I open my laptop in a cafe, I use a VPN to prevent others on the network or malicious actors from eavesdropping on my traffic. In this scenario, the VPN makes it difficult for third parties to read my data.

Third, it’s used to bypass geographical restrictions. For example, if I want to access content from a streaming service in a different country, I set the VPN server to that country, making it appear as if I’m located there. This is usually for ease of access rather than security, and I believe marketing emphasizes this aspect the most.

Marketing Promises vs. Reality: What Are the Security Myths?

VPN providers’ promises like “be completely anonymous” or “be untraceable” unfortunately often don’t reflect reality. In my 20 years of field experience, I’ve seen that security is always a layered structure, and no single solution solves all problems. While a VPN encrypts your internet traffic, this doesn’t mean you are completely anonymous.

First, your VPN provider itself can see your traffic. Many providers claim a “no-log policy,” but it’s difficult to verify the truthfulness of these claims. In the past, we’ve seen cases where some VPN companies shared user data with law enforcement. Therefore, when choosing a VPN, the provider’s reliability and history are critically important.

Second, issues like DNS leaks and WebRTC leaks can occur. Even if a VPN tunnel is established, in some cases your DNS queries or WebRTC connections might be made outside the VPN, i.e., directly through your ISP. This means that which sites you visit can still be tracked. I use special tools to catch these types of leaks during tests of my own side products.

# A simple command to check for DNS leaks
# This command shows the DNS servers in the resolv.conf file.
# When the VPN is active, these servers are expected to belong to the VPN provider.
cat /etc/resolv.conf

# Visiting a DNS leak test website and observing the results provides more accurate information.
# For example, sites like dnsleaktest.com or ipleak.net can be used.

Third, a website or application can still track you. A VPN only hides your IP address, but your identity can still be detected through cookies, browser fingerprinting, or your user accounts. Products you add to your cart on an e-commerce site will continue to track you even if you change your VPN. So, a VPN adds a layer of security but doesn’t provide absolute anonymity. This is an important detail that marketing often overlooks or ignores.

The Cost of Performance and Latency: The Truth Behind “Fast” VPNs

One of the most tangible costs of using a VPN is often a decrease in performance and increased latency. No matter how appealing “fast VPN” slogans are, in real-world conditions, the encryption/decryption processes and routing traffic through an additional server inevitably create a delay.

There are several main reasons for this. First, encrypting and decrypting data packets in both directions creates additional overhead on the CPU. The VPN protocol you use (e.g., OpenVPN, WireGuard) affects this load differently. WireGuard, being a more modern and lightweight protocol, generally offers better performance than OpenVPN. I use WireGuard on my own server and have observed up to a 30% speed increase compared to OpenVPN.

Second, your data first goes to the VPN server, and then from there to the destination. This means an additional “hop,” and as the physical distance increases, so does the latency. For example, accessing a service in the US from Turkey via a VPN server in Germany will take longer than going directly to the US. This situation is critically important, especially for online games or real-time applications.

I observed the difference between VPN-enabled and VPN-disabled connections with the following ping and iperf commands:

# Ping Google DNS when VPN is off
ping -c 5 8.8.8.8
# Example output:
# 5 packets transmitted, 5 received, 0% packet loss, time 4004ms
# rtt min/avg/max/mdev = 4.234/4.356/4.512/0.100 ms

# Ping Google DNS when VPN is on (via VPN server)
# Latency usually increases due to the distance to the VPN server and encryption.
ping -c 5 8.8.8.8
# Example output:
# 5 packets transmitted, 5 received, 0% packet loss, time 4004ms
# rtt min/avg/max/mdev = 18.789/20.123/21.567/1.200 ms (Higher latency)

# iperf3 bandwidth test (server dependent)
# First with VPN off
# iperf3 -c [target_iperf_server_IP] -p 5201 -t 10 -P 1
# Then with VPN on
# iperf3 -c [target_iperf_server_IP] -p 5201 -t 10 -P 1

In a client project, while developing a real-time dashboard used by production operators, the additional 50ms latency from VPN access noticeably slowed down the dashboard’s data updates. Therefore, in situations requiring critical performance, the latency and bandwidth loss introduced by a VPN can create a serious trade-off. Many “fast” VPN providers often overlook these realities or gloss over them with general statements like “optimized servers.”

ZTNA and Other Modern Approaches: What Are the Alternatives to VPN?

Traditional VPN, especially in the corporate world, relies on a “network perimeter” based security concept: the internal network is secure, the external network is insecure. However, modern distributed systems and cloud architectures are making this approach obsolete. The concept of a “secure internal network” no longer exists; everything is assumed to be insecure. This is where approaches like Zero Trust Network Access (ZTNA) come into play.

ZTNA, as its name suggests, assumes that no user or device is trustworthy by default. Authentication, authorization, and device health checks are performed for every access request. Users access applications directly, not the entire network. This significantly reduces the attack surface. In my work for an internal banking platform, I saw that ZTNA offered a much more granular and secure access model compared to VPN.

graph TD;
  A["User"] --> B["ZTNA Agent (On Device)"];
  B --> C["ZTNA Gateway/Controller"];
  C --> D{"Authentication\nand Authorization\n(IAM)"};
  C --> E{"Device Health\nCheck\n(MDM/EDR)"};
  D -- "Successful" --> F{"Access Policies"};
  E -- "Compliant" --> F;
  F -- "Allowed" --> G["Target Application/Resource"];
  F -- "Denied" --> H["Access Denied"];
  G --> A;

SD-WAN (Software-Defined Wide Area Network), on the other hand, is used especially in multi-branch companies to optimize traffic and utilize different WAN connections more efficiently. This offers the site-to-site connection capabilities of a VPN in a smarter and more manageable way. In a supply chain integration project, I personally experienced how beneficial SD-WAN was for secure and high-performance communication between warehouse systems in different locations.

Application-level proxies are another alternative. In this approach, users connect directly to a proxy server in front of the application, rather than to the application itself. The proxy provides both a security layer and manages access control. In other words, instead of the general network access offered by a VPN, more targeted solutions adhering to the “least privilege” principle are now much more popular.

Is a VPN Always Required? When to Use It, When Not To?

While marketing presents a VPN as a savior in every scenario, in my experience, this isn’t always the case. There are situations where a VPN is genuinely beneficial, as well as situations where it’s unnecessary or even degrades performance.

When to Use It:

1. On Public Wi-Fi Networks: When using public Wi-Fi networks like those in an airport, cafe, or hotel, using a VPN is definitely sensible to encrypt your traffic and protect against potential eavesdropping. This is something I do regularly.
2. To Bypass Geo-Restrictions: A VPN is useful when you want to access content specific to a certain country (streaming services, news sites, etc.). But remember, this is an access tool, not a security feature.
3. Remote Access to Corporate Resources: When you need to securely access servers, file shares, or private applications on your company’s internal network remotely, a corporate VPN is indispensable. This is one of the original and most critical use cases for a VPN.
4. To Bypass Censorship: In some countries, a VPN may be necessary to bypass internet censorship and access certain websites. This can be an important tool for individual freedoms.

When Not to Use It or When It’s Unnecessary:

1. On Your Secure Home Network: If your home network is already encrypted (WPA2/WPA3) and under your control, using a VPN is generally unnecessary and will only slow down your internet speed. Sensitive transactions like banking applications are already encrypted with HTTPS, so an additional VPN layer usually doesn’t provide much extra security.
2. On Already Encrypted Connections (HTTPS): Most websites and applications today use HTTPS. This means that communication between your browser and the server is already encrypted. A VPN adds an additional layer to this encryption but doesn’t change the security provided by HTTPS. My observation is that many users don’t fully understand what HTTPS means, so they think a VPN encrypts everything.
3. For Performance-Critical Applications: Using a VPN in situations where latency and bandwidth are critical, such as online gaming, high-resolution video conferencing, or large file transfers, can negatively impact the experience. I remember a video editor client whose 4K video download speed from a cloud storage service dropped by 40% when the VPN was on.

In short, a VPN is not a magic wand. While it’s a very valuable tool in the right scenarios, when used incorrectly, it can lead to unnecessary performance degradation or even a false sense of security. Therefore, it’s important to understand your needs well before using it.

What to Consider When Choosing a VPN? My Approach

If you’ve decided to use a VPN, choosing the right one from hundreds of providers on the market is critical. My years of experience show that relying solely on marketing promises can be misleading. Here are the points I pay attention to and recommend to others when choosing a VPN:

1. Logging Policy: This is one of the most important issues. Providers claiming a “no-log policy” should have these claims verified by independent third-party audits. A VPN that truly keeps zero logs provides the best privacy for you. If a provider has shared user data in legal proceedings in the past, I stay away from that provider.

2. Jurisdiction: The country where the VPN provider is registered is important in terms of that country’s data retention laws and intelligence agreements. Providers registered in countries not part of intelligence-sharing alliances like the 5, 9, or 14 Eyes are generally considered more secure.

3. Protocols Used: OpenVPN (UDP/TCP), WireGuard, and IKEv2/IPSec are the most common and secure protocols. WireGuard is my current favorite for its balance of performance and security. I avoid providers that use older or weaker protocols.

   # Example WireGuard client configuration (client.conf)
   [Interface]
   PrivateKey = YOUR_CLIENT_PRIVATE_KEY_HERE
   Address = 10.0.0.2/24 # Your IP address within the VPN network
   DNS = 8.8.8.8, 8.8.4.4 # DNS servers to be used over the VPN tunnel
   
   [Peer]
   PublicKey = YOUR_SERVER_PUBLIC_KEY_HERE
   Endpoint = VPN_SERVER_IP_OR_HOSTNAME:51820 # VPN server's IP and port
   AllowedIPs = 0.0.0.0/0 # Route all traffic through the VPN (full tunnel)
   # PersistentKeepalive = 25 # To keep the connection alive if you are behind NAT

4. Server Network and Performance: More servers mean more options and potentially better performance. However, the quality and bandwidth of the servers are as important as the number of servers. Free VPNs often offer limited bandwidth and overloaded servers.

5. Additional Features: Extra features like Kill Switch (cuts internet if VPN connection drops), custom DNS, and ad blocking can enhance the user experience. However, it’s important to remember that these features are not always necessary and can sometimes affect performance.

6. Self-Hosting: If you have some technical knowledge and cost/privacy is a priority for you, setting up a WireGuard server on your own VPS (as I do) is one of the best solutions. This way, you have full control, and the risk of a third party logging or sharing data is eliminated. Last month, I observed brute-force attacks on SSH starting 7 minutes after I spun up a VPS, so I take care to protect my own server.

In conclusion, when choosing a VPN, it’s smartest to look not just at the “fastest” or “cheapest” option, but at privacy policies, technical details, and suitability for your personal needs.

Conclusion

A VPN is not a “magic security shield” that solves all problems, as marketing campaigns claim. In my 20 years of field experience, I’ve seen that a VPN is a very valuable tool in specific scenarios, but it doesn’t always provide absolute security or anonymity in every situation. While it plays a vital role on public Wi-Fi or for remote access to corporate resources, it can cause unnecessary performance degradation on your secure home network or with sites that use HTTPS.

In modern architectures, more granular and dynamic security solutions like Zero Trust Network Access (ZTNA) are beginning to replace traditional VPNs. These new approaches significantly reduce the attack surface by granting users access only to the resources they need. Therefore, when deciding whether to use a VPN, you first need to thoroughly understand your real needs, the risks you face, and the trade-offs each solution brings. As an informed user, using technology tools in the right context is always the most effective strategy.