![]() ![]() They do the same thing - send a packet to the DNS resolver. To illustrate the latter, consider these two snippets. It is possible to use connected sockets for ingress handling, and unconnected for egress. ![]() UDP clientĪs we'll learn today, these can be mixed. Traditionally the connected sockets were mostly used for outgoing flows, while unconnected for inbound "server" side connections. Connected sockets have a full 4-tuple associated. UDP sockets can be "connected" (or "established") or "unconnected". How do you "accept" connections on a UDP server? If you are using unconnected sockets, you generally don't.īut let's start with the basics. ![]() In this blog post we'll cover the basics: all you need to know about UDP servers to get started. We have a lot of generic UDP traffic going through our Spectrum service.Īlthough UDP is simple in principle, there is a lot of domain knowledge needed to run things at scale. We operate WARP - our Wireguard protocol based tunneling service - which uses UDP under the hood. QUIC is a new transport protocol based on UDP, it powers HTTP/3. Stateful UDP gains popularity for a number of reasons: Recently though, we started operating big scale stateful UDP services. We've spent significant effort optimizing traditional HTTP/1.1 and HTTP/2 servers running on top of TCP. Historically Cloudflare's core competency was operating an HTTP reverse proxy. Snippet from internal presentation about UDP inner workings in Spectrum. ![]()
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