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TCP protocol vs UDP: which one your VPN should use
Two transports carry nearly everything on the internet. Which one your tunnel uses decides where it works and how it feels.
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TCP vs UDP: the short answer
TCP sets up a connection, numbers every packet, resends anything that gets lost and delivers data in order. UDP sends packets without any of that. There is no connection, no resending and no ordering. TCP is reliable and carries a little more overhead. UDP is lighter and leaves reliability to the application. Web pages, mail and downloads use TCP. Calls, games and live video mostly use UDP, and so does the newer web protocol, QUIC.
For a VPN the choice is a trade. UDP is usually faster and smoother. TCP on port 443 gets through networks that block everything else.
TCP protocol vs UDP at a glance
Inside a VPN
WireGuard runs over UDP only. OpenVPN can use either. IKEv2 uses UDP. On an open home connection those UDP tunnels perform very well. On a campus, hotel or corporate network UDP is frequently restricted and the VPN handshake is recognised and dropped. A tunnel over TCP port 443 looks like ordinary secure web traffic, and blocking it would break the web, so it passes.
There is one known drawback. When TCP traffic is carried inside a TCP tunnel on a poor line, both layers try to recover lost packets and can amplify the delays. Modern implementations reduce the effect, and on a decent connection you will not notice it.
Where VLESS over Reality sits
A BSR key uses VLESS over Reality on TCP port 443. The reason is reach: it works on networks where UDP based tunnels fail, and its handshake is indistinguishable from a visit to a major website. UDP traffic from your apps, such as games, calls and QUIC, is carried inside the tunnel, so those apps keep working. The cost is a small amount of extra latency compared with a pure UDP tunnel on an unrestricted network.
If you only ever connect from an open home line and want the lowest possible latency, a UDP protocol such as WireGuard is a reasonable choice. If you also use Wi-Fi networks that you do not control, reach matters more than the last few milliseconds.
Practical consequences
Testing it on your own line
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TCP protocol vs UDP: which one your VPN should use - 5 days free
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Notes to the statement
Questions people ask before the first key
Is UDP faster than TCP?
It has less overhead and never waits for retransmissions, so it often feels faster for real time traffic. For downloads the difference is small.
Why do VPNs on TCP 443 work on school Wi-Fi?
Because that port carries all secure web traffic. A network cannot block it without breaking most websites.
Does a TCP tunnel break online games?
No. Game traffic is carried inside the tunnel. Latency rises slightly, mostly according to the distance to the server.
What is the problem with TCP inside TCP?
On lossy lines both layers retransmit, which can amplify delays. On a stable connection it rarely shows.
Which protocol does BSR use?
VLESS over Reality on TCP port 443. It was chosen because it passes filtered networks.
Can I switch the key to UDP?
No. The transport is part of the key. The client needs no setting for it.
Still unsure?
Support and your key live in the same Telegram bot. The setup page shows which client to install.