That said, probably the best general advice is to use the faster UDP protocol unless you experience connection problems, which is the strategy adopted by most VPN providers by default. If the server is relatively close-by, then you may not see much of a speed loss, while benefiting from a more reliable connection. The further away you are from your VPN server geographically, the further TCP packets have to travel to and fro, and therefore the slower your connection will be. However, how much TCP actually slows a connection down in practice can be very dependent on other network factors, with distance being the most important. Which one you use, therefore, depends on whether reliability or speed is your primary concern, and, in general, UDP is better for streaming VoIP, and playing games online. This makes it much faster, but less reliable. UDP is referred to as a ‘stateless protocol’ as it performs no such error correction, simply receiving packets with no or retries. This means there is ‘guaranteed delivery’ of all data, making the protocol very reliable, but there is a considerable overhead as packets are sent, confirmed, re-sent etc., making it quite slow. Whenever a computer sends a network packet using TCP, it waits for confirmation that the packet has arrived before resending the packet (if no confirmation is received), or sending the next packet (if confirmation is received). TCP is, in general, the most commonly used connection protocol on the internet, as it offers error correction (and is therefore known as a ‘stateful protocol’). TCP vs UDP, OpenVPN vs TCP, UDP vs OpenVPN. The reason for this is that while both offer distinct advantages and disadvantages in each other, choosing which is ‘best is’ difficult, as it depends what the internet is being used for, and what matters to individuals most – speed or reliability. Some VPN providers, however, prefer to let customers choose which connection protocol they prefer. Choosing which one to use is a highly technical issue, and one that most VPN providers (quite understandably) keep hidden ‘behind the scenes’. OpenVPN can run over either the TCP (Transmission Control Protocol) or UDP (User Datagram Protocol) transports.
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