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What is OpenVPN?

OpenVPN is an established, open-source VPN protocol ecosystem that can carry a protected connection over TCP or UDP. With VeePN, you can use OpenVPN across supported apps and for router or manual configurations, then choose the transport that fits your network conditions.

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What is OpenVPN?
OpenVPN: protocol, project, and software

OpenVPN: protocol, project, and software

OpenVPN is the name of an open-source project, a VPN protocol, and a wider ecosystem of compatible software. VPN services can use it to create a protected tunnel between a device and a VPN server. Traffic that enters this tunnel is encapsulated and carried across the network before the VPN server forwards it to its destination.

One of OpenVPN's defining features is transport flexibility. It can operate over TCP or UDP. These options do not create two unrelated VPN protocols. They give the same OpenVPN connection different ways to move data between the client and server.

How does OpenVPN work?

An OpenVPN connection brings together a compatible client, a VPN server, and a configuration that tells them how to communicate. The exact implementation can vary, but the general connection flow looks like this:

  1. 1

    The client contacts the VPN server.

    The app or compatible client uses its configuration to reach a server that accepts OpenVPN connections.

  2. 2

    The two sides authenticate.

    The client and server verify the connection using the authentication method defined by the service and configuration.

  3. 3

    They establish a protected session.

    The two sides agree on the session parameters needed to create and maintain the VPN tunnel.

  4. 4

    OpenVPN carries network traffic.

    The client encapsulates traffic and sends it through the tunnel using either TCP or UDP as the outer transport.

  5. 5

    The server forwards and returns traffic.

    The VPN server sends requests toward their destinations and returns responses through the protected connection.

The TCP or UDP choice changes how OpenVPN transports tunnel data. It does not change the basic purpose of the tunnel. Routing scope can also vary, particularly with routers and manual configurations, so setup instructions matter.

OpenVPN advantages and limitations

  • Choose between TCP and UDP

    Choose between TCP and UDP

    OpenVPN lets you change the transport without switching to a completely different VPN protocol. UDP reduces transport control and overhead, while TCP adds ordered delivery and retransmission. This gives you a practical way to respond when network conditions change.

  • Connect across supported devices

    Connect across supported devices

    VeePN makes OpenVPN available across major desktop, mobile, and TV platforms. That broad availability can help users keep a familiar protocol option when moving between supported devices. See the VeePN availability list for the confirmed platforms.

  • Use OpenVPN on a router

    Use OpenVPN on a router

    OpenVPN TCP and UDP are also available for VeePN router and manual setup. A compatible router configuration can extend a VPN connection to devices that use that router, including devices that may not run a native VPN app. Compatibility and traffic routing still depend on the router, firmware, and configuration.

OpenVPN is flexible, but that flexibility comes with trade-offs. Consider both sides before choosing it for a particular device or network.

  • Advantages Limitations
  • Supports both TCP and UDP transports Can involve more configuration complexity than some newer protocols
  • Has a broad open-source software and tooling ecosystem Encryption and encapsulation add processing and packet overhead
  • Offers broad compatibility across device categories in general TCP mode can magnify congestion and retransmission effects when tunnel traffic also uses TCP
  • Is available in VeePN across supported desktop, mobile, and TV apps Real-world speed varies with the device, server, distance, network, and configuration
  • Supports VeePN router and manual configurations Router compatibility and performance vary by model and firmware
  • Provides another transport to try when network conditions change VeePN browser extensions do not use OpenVPN

OpenVPN TCP vs UDP

OpenVPN TCP and OpenVPN UDP create the same type of VPN tunnel, but the outer transport handles delivery differently. UDP sends independent datagrams without TCP-style delivery confirmations or ordering. TCP creates an ordered, reliable byte stream and retransmits missing data. This changes overhead, latency, and behavior when packets are delayed or lost.

  • OpenVPN UDP

    OpenVPN UDP

    UDP does not wait for the outer transport to confirm that every datagram arrived or request a replacement for each missing one. With fewer delivery controls, it generally has lower transport overhead than TCP. That makes OpenVPN UDP a sensible starting point for everyday use and time-sensitive activities such as streaming, gaming, and voice or video calls. Applications can often handle occasional loss themselves, and receiving current data may matter more than recovering an older packet. Some networks may limit or handle UDP inconsistently. If the connection fails or disconnects repeatedly, TCP is another option to test.

  • OpenVPN TCP

    OpenVPN TCP

    TCP tracks data order and delivery. When data is missing, it can retransmit it before presenting the ordered stream to the receiving side. This behavior makes TCP worth testing if the current network does not handle UDP consistently. The trade-off is additional overhead. Waiting for delivery and retransmitting data can increase latency or reduce throughput, especially on a congested or unreliable network. TCP is therefore not an automatic stability upgrade for every connection. It is a practical alternative to try when UDP does not work well on the network you are using.

  • Criterion OpenVPN UDP OpenVPN TCP
  • Transport behavior Datagram-based Ordered, reliable byte stream
  • Delivery checks No TCP-style checks at the outer transport layer Checks order and delivery, then retransmits missing data
  • Typical overhead Lower Higher
  • Useful starting point Everyday and time-sensitive activity Networks where UDP is unavailable or inconsistent
  • Main trade-off UDP itself does not recover lost datagrams Extra checks and retransmission can reduce performance

When to use OpenVPN TCP or UDP

Start with OpenVPN UDP when it connects reliably and lower transport overhead is the priority. Try OpenVPN TCP when UDP is unavailable, disconnects repeatedly, or behaves inconsistently on the current network. If neither works well, compare other options on the VeePN protocols page.

OpenVPN for routers and manual setup

OpenVPN for routers and manual setup

VeePN lists OpenVPN TCP and UDP for routers and manual setup. A compatible router can extend the connection to Apple TV, Smart TV, PlayStation, Xbox, and other devices that use that router. Compatibility, coverage, and performance depend on the router, firmware, routing rules, and configuration, so follow the current VeePN router setup guide.

Where is OpenVPN available in VeePN?

VeePN supports OpenVPN TCP and OpenVPN UDP on the following platforms and setup categories:

VeePN browser extensions do not use OpenVPN. They use a browser connection mode rather than extending an OpenVPN tunnel to every app on the device.

Protocol availability may vary by app version.

How to use OpenVPN in VeePN

Follow these steps to switch to OpenVPN in VeePN.

1 STEP

Open Settings

Open VeePN and go to Settings.

2 STEP

Choose OpenVPN TCP or UDP

Select OpenVPN TCP or OpenVPN UDP from the available protocols.

3 STEP

Reconnect

Reconnect to apply the new protocol.

OpenVPN vs WireGuard

OpenVPN and WireGuard can both provide VPN connections in supported VeePN apps. They take different design approaches, so the better fit depends on your platform, network, and setup requirements.

OpenVPN is established and highly configurable. Its ability to operate over TCP or UDP gives you an extra transport choice, and it is the option listed for VeePN router and manual setup. This can matter when you need compatibility with a manual workflow or want to test a different transport on a particular network.

WireGuard has a modern, streamlined design focused on efficient operation. It is a strong option for an everyday app connection when it is available on your device. It uses UDP rather than offering a TCP mode.

  • Criterion OpenVPN WireGuard
  • Design direction Established and highly configurable Modern and streamlined
  • Transport choice TCP or UDP UDP
  • Typical performance direction More processing and configuration overhead Designed for efficient performance
  • Router and manual setup Available Not listed as available
  • VeePN app availability Windows, macOS, Android, Android TV, Fire TV Stick, iOS Windows, macOS, Android, Android TV, Fire TV Stick, iOS
  • Consider it when TCP/UDP or router/manual flexibility matters An efficient everyday app connection is the priority

Neither protocol is always the right choice. Start with the one that fits your device and use case, then compare results on the network you actually use.

Related VeePN protocols

  • WireGuard

    A modern, streamlined VPN protocol for efficient everyday connections on supported VeePN apps.

  • IKEv2

    Another app-based protocol available on supported VeePN desktop, mobile, and TV platforms.

  • Shadowsocks

    An encrypted HTTPS proxy option intended for web traffic in limited network environments.

Compare all VeePN protocols

OpenVPN FAQ

Is OpenVPN an app or a protocol?

The name can refer to several connected things: the open-source OpenVPN project, the protocol used to create VPN tunnels, and compatible client or server software. In VeePN, OpenVPN appears as a connection option managed through the VeePN app or an approved manual setup.

Why can OpenVPN be slower on some connections?

OpenVPN must encrypt and encapsulate traffic, which adds processing and packet overhead. Performance can also change with TCP or UDP, device capability, local network quality, server load, and distance to the VPN server. TCP delivery checks and retransmission can add further delay when the network loses packets.

Can OpenVPN protect devices that do not support VPN apps?

A compatible router setup may extend the VPN connection to devices that use that router, including devices without a native VPN app. Coverage depends on router compatibility, routing rules, firmware, and configuration. Check the VeePN router setup guide before configuring your network.

Does VeePN use OpenVPN in browser extensions?

No. VeePN browser extensions do not use OpenVPN. A browser extension handles the browser connection rather than creating an OpenVPN tunnel for traffic from every app on the device.

Can I switch between OpenVPN TCP and UDP?

Find the protocol or connection option in the VeePN app settings and choose OpenVPN TCP or OpenVPN UDP. Available choices and interface details may vary by platform and app version. Reconnect if required.

Use OpenVPN with VeePN

Use OpenVPN when you want TCP/UDP flexibility across supported VeePN apps or need a compatible router or manual configuration. Choose an available option for your device and connect through VeePN.

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