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examples: add UDP binding to all interfaces docs (#8283)

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Closes #6737
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kai-xlr
2026-07-15 17:05:27 +00:00
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parent 315a320e96
commit 9cae638de6
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examples/echo-udp.rs
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@@ -9,6 +9,28 @@
//! cargo run --example connect-udp 127.0.0.1:8080
//!
//! Each line you type in to the `connect-udp` terminal should be echo'd back to you!
//!
//! # Binding to all interfaces
//!
//! By default this example binds to `127.0.0.1` so it is only reachable
//! from the local machine.
//!
//! To listen on all interfaces instead:
//!
//! ```sh
//! cargo run --example echo-udp -- 0.0.0.0:8080
//! ```
//!
//! Binding to `0.0.0.0` exposes the server on all network interfaces.
//! Only do this in trusted network environments.
//!
//! On multi-homed systems, a UDP socket bound to a wildcard address
//! (`0.0.0.0` or `::`) cannot always send replies from the same local IP
//! that received the packet. Replies may therefore originate from a
//! different address than the client targeted. See [this Cloudflare blog
//! post][udp-blog] for more details.
//!
//! [udp-blog]: https://blog.cloudflare.com/everything-you-ever-wanted-to-know-about-udp-sockets-but-were-afraid-to-ask-part-1
#![warn(rust_2018_idioms)]