ProtonVPN vs Mullvad VPN Anonymous Port Forwarding and Security Compared

If you're looking to host game servers, access your home network remotely, or improve torrenting speeds, you need a VPN that offers anonymous port forwarding. This feature allows incoming connections to reach your device through the VPN tunnel, but not all providers implement it with the same commitment to privacy. We're putting two privacy-focused giants, ProtonVPN and Mullvad VPN, under the microscope to see which one truly delivers secure and anonymous port forwarding for your needs.

What you’ll learn:

• The critical security differences in how ProtonVPN and Mullvad handle port forwarding.
• Which service offers a more straightforward and private setup process.
• How their overall security features stack up beyond just port forwarding.

What is Anonymous Port Forwarding and Why Does It Matter?

In simple terms, port forwarding is like giving a specific delivery driver directions to your apartment door instead of leaving your package in the building's main lobby. It allows data from the internet to find its way directly to a specific device or application on your private network. Without a VPN, this process exposes your real IP address to anyone connecting, which is a significant privacy risk.

This is where anonymous port forwarding through a VPN becomes essential. It routes these incoming connections through the VPN server first. The external service or user only sees the VPN server's IP address, keeping your own location and identity hidden. This is crucial for activities like peer-to-peer file sharing, where you want to connect with others without revealing your home network, or for hosting a game server where you don't want to dox your personal IP to every player.

Mullvad VPN: The Gold Standard for Anonymous Port Forwarding

Mullvad VPN has built its entire reputation on a no-compromise approach to privacy, and its implementation of anonymous port forwarding is a perfect example. The process is designed from the ground up to be detached from your identity.

How Mullvad's Port Forwarding Works

When you need to forward a port with Mullvad, you simply log into your account on their website—which is accessed using your randomly generated 16-digit account number, not an email and password. From there, you can open up to five ports. The system does not tie these ports to your specific VPN connection or server. Instead, any port you open is active across Mullvad's entire server network that supports forwarding.

This means you can disconnect from one server, connect to another in a different country, and your forwarded ports remain the same and functional. There is no logging of which account uses which port for what purpose. The port is just an open door on their network, and the key is your configuration; Mullvad deliberately does not hold the data to link the two.

Security and Privacy Implications

This model is arguably the most private available. Because the port isn't locked to a single server, it's harder to trace activity back to a specific user session. Mullvad's use of account numbers instead of personal information for login further anonymizes the process. They accept anonymous payments like cash and cryptocurrency, completing a privacy chain that makes true anonymous port forwarding a reality.

ProtonVPN: A Secure But More Managed Approach

ProtonVPN, the sister service of the renowned Proton Mail, takes a highly security-conscious but slightly different approach. They offer port forwarding, but with more guardrails in place.

How ProtonVPN's Port Forwarding Works

ProtonVPN's port forwarding is a feature reserved for its paid Visionary and Unlimited plans, as well as some older legacy plans. Unlike Mullvad, you must use the ProtonVPN application to enable it. You can't manage your ports via the web account dashboard. The feature is called “Port Forwarding” within the app's advanced settings, and when you enable it, the app automatically assigns a random port for you to use.

This port is tied to the specific VPN server you are connected to at that moment. If you disconnect and reconnect, you will likely be assigned a new random port. This means your port number can change with each new connection, which adds a layer of obfuscation but can be inconvenient for services that require a consistent port number.

Security and Privacy Implications

ProtonVPN's managed system is very secure. The automatic assignment of random ports makes it difficult for someone to scan for commonly used ports on their network. By tying the feature to the app and specific server session, they maintain a high degree of control, which can help prevent abuse of their network. However, this managed approach means ProtonVPN has more technical ability to link a port to a specific user session than Mullvad does, even if their privacy policy states they do not log this information.

Head-to-Head Comparison: Anonymous Port Forwarding

Let's break down the key differences between these two services in a direct comparison.

Beyond Port Forwarding: Overall Security Showdown

While anonymous port forwarding is our focus, it exists within a broader security framework. Here’s how the two providers stack up elsewhere.

Jurisdiction and Logging Policies

Mullvad is based in Sweden, a member of the 14-Eyes intelligence alliance, which is less than ideal. However, they mitigate this with a proven no-logs policy that has been verified during a server seizure by authorities, who found no user data. ProtonVPN is based in Switzerland, which has strong privacy laws and sits outside the 14-Eyes alliance, providing a jurisdictional advantage from the start.

Core Security Features

Both services are top-tier. They offer:

• Diskless RAM-only servers: All data is wiped on reboot, leaving nothing behind for physical seizure.
• Audited no-logs policies: Both have undergone independent security audits to verify their privacy claims.
• Advanced tunneling: Both support the robust WireGuard® protocol for a great blend of speed and security.

ProtonVPN has a unique advantage with its Secure Core feature, which routes your traffic through multiple servers in privacy-friendly countries before it exits to the internet, defending against sophisticated network-based attacks.

Speed and Performance

For most users, both VPNs will provide more than enough speed for browsing, streaming, and torrenting. Mullvad's extensive server network and WireGuard implementation often yield consistently high speeds. ProtonVPN is also very fast, though its Secure Core feature will understandably introduce some latency due to the extra hops.

Which VPN is Right for Your Anonymous Port Forwarding Needs?

Choosing between ProtonVPN and Mullvad VPN for anonymous port forwarding ultimately comes down to your specific use case and privacy threshold.

Choose Mullvad VPN if: Your priority is the absolute highest level of anonymity for port forwarding. You need stable, permanent ports for hosting game servers, a website, or other services where the port number cannot change. You value a simple, account-number-based system that is completely detached from your personal information.

Choose ProtonVPN if: You are on a compatible plan and prefer a more security-managed approach. Your port forwarding needs are for occasional torrenting or remote access, where a changing port isn't a deal-breaker. You also want the added protection of features like Secure Core and the benefit of an integrated suite of privacy tools from a trusted company.

Both ProtonVPN and Mullvad are exceptional services that put user privacy first. Mullvad offers a purist's approach to anonymous port forwarding that is nearly impossible to beat for detachment and stability. ProtonVPN provides a highly secure, app-managed system that integrates seamlessly into its broader security-focused ecosystem. Assess what you need most—ultimate anonymity or managed security—and you'll have your winner. Ready to lock down your connections? Explore our detailed VPN reviews to find the perfect fit for your digital life.