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The mDNS discovery mechanism will automatically broadcast your endpoint’s presence on the local network, and listen for other endpoints doing the same. When another endpoint is discovered, the dialing information is exchanged, and a connection can be established directly over the local network without needing a relay. Devices need to be connected to the same local network for mDNS discovery to work. This can be a Wi-Fi network, an Ethernet network, or even a mobile hotspot. mDNS is not designed to work over the internet or across different networks.

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Usage

Local Discovery is not enabled by default, and must be enabled explicitly. You’ll need to add the discovery-local-network feature flag to your Cargo.toml to use it. 
[dependencies]
# Make sure to use the most recent version here instead of nn. (at the time of writing: 0.32)
iroh = { version = "0.nn", features = ["address-lookup-mdns"] }
Then configure your endpoint to use local discovery concurrently with the default DNS discovery: 
use iroh::{Endpoint, endpoint::presets};

let mdns = iroh::address_lookup::mdns::MdnsAddressLookup::builder();
let ep = Endpoint::builder()
    .address_lookup(mdns)
    .bind(presets::N0)
    .await?;
For more information on how mDNS discovery works, see the mDNS documentation.