Name: Byteful
Brand: Byteful
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Question 1

Can a proxy even carry UDP traffic, or only TCP?

Accepted Answer

A proxy can carry UDP traffic, but only if the provider and the transport protocol support it. For instance, a standard HTTP proxy is mostly TCP-only since it tunnels via HTTP CONNECT. Still, HTTP proxies can also relay UDP datagrams with CONNECT-UDP as standardized in RFC 9298, provided the proxy and client implement it.

If not HTTP-based tunneling, a proxy needs to support SOCKS5 UDP ASSOCIATE. This is the current UDP-proxy industry standard and is widely used in online gaming and VoIP calls. At Byteful, we fully support UDP ASSOCIATE over SOCKS5 with our datacenter and ISP proxies and are soon going to roll this out for residential and mobile proxies as well.

Question 2

What is the difference between a UDP proxy and a TCP proxy?

Accepted Answer

UDP and TCP proxies are fundamentally different and are used according to their protocol strengths. TCP, for example, is best known for its connection setup, reliability, and ordered packet delivery. It also natively ships flow control, congestion control, error correction, and lost-data retransmission. These traits make TCP proxies a good fit for workflows such as web scraping, file transfer, email, and remote access. However, these reliability and safety mechanisms also increase connection latency and make their implementation slightly more complex. When you hear about HTTP/1.1 or HTTP/2, they typically use TCP under the hood. In practice, many proxies handle TCP only, so UDP support is the first thing to confirm with a provider. By contrast, UDP proxies are connectionless. Packets aren't guaranteed to be delivered, and if they reach their intended target, sequential delivery might not be guaranteed. UDP also has limited error detection capabilities and no flow or congestion control of its own (must be handled with the application layer instead). While all these might sound like shortcomings, they make UDP have comparatively low overhead and allow sending datagrams quickly without waiting for delivery acknowledgments. Furthermore, it lets developers implement their own reliability, flow, and congestion control elements as required. This flexibility and minimalist architecture allow UDP to support different use cases, including real-time traffic like video and audio transmission (video calls, online gaming, etc.).

Question 3

What are UDP proxies used for?

Accepted Answer

UDP's real-time packet delivery without handshakes or delivery checks makes it a preferred choice for online gaming and VoIP communication. Since online gaming is based on real-time updates, a UDP proxy works better since it doesn't wait for retransmissions, which can induce delays. Another benefit is that UDP doesn't mandate sequential packet delivery. Therefore, it doesn't suffer from TCP's head-of-line (HOL) blocking, and a lost packet doesn't stall the connection stream. It plays a critical role in audio/video VoIP calls. So, even if a connection freezes, it simply carries over from the present rather than sending over the lost media. The Domain Name System (DNS) also commonly uses UDP for queries and responses because of its speed and low overhead. However, it switches to TCP for large messages (greater than 512 bytes) and for responses that get truncated over UDP. UDP also underpins newer transports such as QUIC, the base of HTTP/3 (proxies), and WebRTC, so applications built on those need UDP support as well.

Question 4

Does a UDP proxy add lag to gaming or calls?

Accepted Answer

A proxy or any intermediary server introduces additional hop(s) and processing, which naturally increases latency compared to connecting directly. However, a direct connection can also feel slow if your ISP uses a poorly optimized route to the target server. Consequently, a UDP proxy adding lag to gaming or calls depends on how the ISP would handle it otherwise. Still, a small amount of extra lag with proxies is a common outcome, and its amount depends on the proxy’s location, server load, and network path. The honest case for a UDP proxy is geography, privacy, and getting UDP traffic through at all, not raw speed. If the primary objective is lower ping, route optimization tools are the better answer.

Question 5

How do you set up a UDP proxy with SOCKS5?

Accepted Answer

You need three things to get started: A SOCKS5 proxy with support for UDP ASSOCIATE, a SOCKS5-compatible client able to relay UDP, and a UDP socksifier for apps that have no native proxy settings. To start, a client opens a TCP control connection to the SOCKS5 server and sends a UDP ASSOCIATE request. Next, the client gets a relay address and port for sending UDP datagrams. Every UDP datagram includes a SOCKS5 UDP header with destination IP, port, and the payload. Importantly, the TCP connection must remain active for the entirety of the UDP association.

Question 6

Why is UDP so often blocked, and does a proxy help?

Accepted Answer

Unlike TCP, UDP is sometimes blocked by network firewalls. The most common reason behind that is security, since UDP is connectionless. It doesn't authenticate the sender, which allows attackers to impersonate a legitimate IP address. Besides, UDP has no connection state of its own, so firewalls must maintain separate state-tracking mechanisms because they can't reliably tell malicious traffic from genuine application requests. Furthermore, UDP has no congestion control, allowing a bad actor to use the entire or most of the available bandwidth to orchestrate DDoS-like cyberattacks. Also, UDP doesn't indicate when a connection is closed at the client end, leaving the target NAT guessing and mostly closing the connection after as little as 30 seconds of inactivity. A UDP proxy can help in certain ways. First, it can apply its own rate limits and access control to stop possible cyberattacks. In addition, it can encapsulate UDP datagrams with a header naming their destination, so firewalls allow UDP traffic to that specific proxy address. The biggest benefit comes in the form of proxy authentication, which helps control who can use the UDP relay, reducing sender impersonation risks. Likewise, your application can send periodic keep-alive messages to help the connection stay active. However, if your local network blocks UDP entirely, a proxy can’t change that. In that case, most applications simply fall back to TCP.

Question 7

Which proxy type should you buy for UDP?

Accepted Answer

A UDP proxy can support gaming, DNS tools, and real-time audio/video relays. However, you must confirm if UDP relay is enabled with the proxy provider. A SOCKS5 UDP proxy is the most common choice to opt for. For instance, Byteful fully supports UDP ASSOCIATE with SOCKS5 with its datacenter and static residential proxies. Alternatively, check if the proxy supports CONNECT-UDP, which works over HTTP/1.1, HTTP/2, and HTTP/3. Datacenter proxies are great for their quick speeds. However, since their IPs belong to hosting providers, sensitive targets block them more often. Static residential proxies offer greater trust and are good where the connection needs stability and should look like it's coming from a regular user.