A VPN is not one feature or one guarantee. Its protocol protects traffic across a tunnel; the app and operating system decide how traffic is routed, when it is blocked or reconnected, and how DNS is handled; and the provider operates the servers and account systems. To compare VPNs meaningfully, check which layer supplies each feature and what remains outside its protection.
What a VPN does—and which part does it
A VPN creates logically isolated connectivity over a shared network: the underlying network is the underlay, and the VPN connection is an overlay. The overlay can protect traffic between its endpoints, but the name “VPN” alone does not establish which endpoints are covered, what happens to traffic outside the tunnel, or whether a provider’s privacy claims are trustworthy.
| Layer | What it determines | What it does not establish by itself |
|---|---|---|
| Protocol | How tunnel peers authenticate, exchange keys, protect packets, and transport them across the network. | How the service provisions accounts or keys, which servers it operates, or how the app routes every device’s traffic. |
| Client app and operating system | Routing, DNS settings, traffic blocking, connection automation, and how a device responds to tunnel failure. | That every app or OS implements a similarly named feature in the same way. |
| Provider or network operator | Server and account operation; in managed services, potentially the underlying network resources and service commitments. | That a protocol’s cryptography proves the provider’s logging or privacy claims. |
Microsoft’s VPN configuration guidance treats routing, name resolution, authentication, and automatic connection as distinct configuration areas. That is a useful way to read consumer feature lists, too: a feature label is not a protocol guarantee.
Core VPN features: tunnel, protocol, keys, and DNS
Tunnel protocol and cryptography
Protocols are not interchangeable bundles of guarantees. WireGuard’s published design specifies a Noise_IK handshake and uses Curve25519 for elliptic-curve Diffie–Hellman, ChaCha20-Poly1305 for authenticated encryption, BLAKE2s, SipHash24, and HKDF. Its transport uses UDP. WireGuard also documents replay-attack protection and perfect forward secrecy as handshake properties. These are properties of the described protocol design, not proof that a particular provider has configured or operated every part of its service correctly.
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Authentication and key management
In WireGuard, tunnel IP addresses are associated with public keys, but key distribution and configuration are deliberately outside the protocol’s scope. A service therefore has separate responsibilities: provisioning an account, distributing or configuring keys, and managing servers and client settings. A modern cipher list does not answer how those operational tasks are handled.
Routing and DNS
Routing decides which packets use the tunnel; DNS settings decide where name lookups go. They are related but distinct. A profile can route some traffic through the VPN while other traffic takes the ordinary network path, and DNS behavior depends on the client and operating-system configuration. When checking a setup, look at both the routes and the DNS rules rather than assuming that a connected tunnel covers every lookup or packet.
App and operating-system controls
Kill switch and traffic blocking
A kill switch is a client or platform behavior intended to block traffic if the VPN path becomes unavailable. It is not a feature guaranteed by the tunnel protocol, and the label alone does not specify which traffic is blocked, when blocking begins, or what happens during reconnects. Microsoft’s managed VPN guidance discusses traffic filtering as a configurable security area; behavior in consumer apps must be checked in the specific app and platform.
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Split tunneling
Split tunneling sends selected traffic through the VPN while other traffic uses the ordinary network route. It can be useful when a device needs access to local resources or when only particular apps or destinations should use the tunnel. Its trade-off is direct: excluded traffic does not pass through that VPN tunnel. The available selection method and interaction with DNS vary by operating system and client.
Force or full tunneling
Force tunneling routes traffic through the VPN according to the profile, rather than deliberately leaving selected traffic on the ordinary route. The exact coverage depends on the profile and implementation; local-network access and exceptions may still be treated differently. Microsoft’s documentation frames split tunneling and force tunneling as separate routing choices, not as different encryption levels.
Always-on and auto-triggered connections
Managed VPN profiles can be configured to connect continuously or to start automatically under specified conditions. Rules can also avoid triggering on trusted networks. These are profile and platform capabilities, not universal properties of a VPN subscription; availability depends on the operating system, client, and management setup.
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Enterprise authentication and access policy
In enterprise deployments, authentication can be tied to access policy and identity systems. Microsoft’s configuration guidance includes EAP authentication and Microsoft Entra conditional access. Those capabilities belong to managed access environments and should not be assumed to come with an ordinary consumer VPN account.
Transport compatibility and obfuscation
Transport determines how tunnel packets travel and can affect compatibility with firewalls and networks. WireGuard sends packets over UDP and does not natively tunnel over TCP. Its design does not focus on obfuscation; wrapping UDP traffic in another transport is an upper-layer mechanism, not stronger encryption supplied by WireGuard itself. Such wrapping introduces its own compatibility and operational trade-offs. When a service advertises “stealth” or “obfuscation,” check whether it describes camouflage, a transport workaround, or a cryptographic change—those are different claims.
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Post-quantum cryptography
WireGuard states that its ordinary handshake is not post-quantum secure by default. It can mix an optional preshared symmetric key into the public-key cryptography, but WireGuard’s limitations guidance cautions against presenting that option alone as a complete post-quantum handshake or as forward-secure post-quantum secrecy. NIST maintains an official Post-Quantum Cryptography project resource, but the existence of that work does not mean a given VPN has deployed it.
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Treat post-quantum VPN support as implementation-specific. A meaningful claim should identify what handshake is used and whether compatible implementations are deployed at both client and server ends. The available evidence here does not establish which consumer providers have deployed interoperable, independently evaluated post-quantum handshakes across their apps and server fleets.
Enhanced VPNs and network resource partitions
IETF RFC 9732, published in March 2025, is an Informational RFC—not an Internet Standards Track specification. It describes an enhanced VPN framework that coordinates an overlay VPN with a Network Resource Partition in the underlay. That coordination can involve buffers, queues, scheduling policies, and topology to support service-specific aims such as low latency, bounded jitter, isolation, resource guarantees, and predictable performance.
This is an operator- and enterprise-network direction, potentially relevant to network slicing, rather than a consumer app feature like a kill switch or server-location selector. RFC 9732 states: “It is not envisaged that enhanced VPN services will replace conventional VPN services.” The statement appears in section 1 of the IETF RFC.
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How to evaluate a VPN feature list
Instead of counting badges, evaluate a service against the job and trust boundary that matter to you:
- Define the threat model: Identify the traffic and endpoints you want protected, and which provider, administrator, or network must still be trusted.
- Inspect the cryptographic description: Look for documented handshake, authentication, key exchange, cipher, and key-rotation properties. Treat post-quantum claims as incomplete unless the implementation and both ends are specified.
- Check transport compatibility: Find out whether the tunnel uses UDP or TCP, how it behaves on restrictive networks, and whether obfuscation is an added layer rather than part of the underlying protocol.
- Trace routing and DNS together: Determine whether the profile is split or full/force tunnel, which apps or destinations are excluded, how DNS is routed, and what the client does if a route or tunnel fails.
- Verify platform support: Check the operating system and device versions, client version, profile requirements, and whether the desired features work together. A setting available in one managed profile may not exist in another client.
- For managed services, examine commitments: If low latency, bounded jitter, isolation, or reserved resources are important, ask what is specified, monitored, and coordinated in the underlay—not just whether traffic is encrypted.
- Check recovery behavior: Find out how the app handles network changes, authentication expiry, disconnection, and reconnection. A feature name is not evidence of behavior under those conditions.
Where a travel router fits
A VPN travel router is an optional way to extend a VPN setup to multiple devices through router hardware; it is neither a VPN subscription nor a requirement for using a VPN app. GL.iNet’s catalog lists travel routers and identifies the Beryl AX (GL-MT3000) as a travel-router model, but that catalog information alone does not establish its precise VPN client modes, protocol support, performance, or current Amazon availability. Verify model-specific details before choosing hardware.
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