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Discovery via DHT in iroh uses the BitTorrent Mainline distributed hash table (DHT) to publish & resolve EndpointIds. DHT Discovery is not enabled by default, and must be enabled by the user. You’ll need to add the discovery-pkarr-dht 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 = ["discovery-pkarr-dht"] }
Then configure your endpoint to use DHT discovery concurrently with mDNS discovery, but not with the default DNS discovery, use the Endpoint::empty_builder method. This requires specifying a RelayMode, which in this example we will keep default. 
use iroh::Endpoint;

let dht_discovery = iroh::discovery::dht::DhtDiscovery::builder();
let mdns = iroh::discovery::mdns::MdnsDiscovery::builder();
let ep = Endpoint::empty_builder(iroh::RelayMode::Default)
    .discovery(dnt_discovery)
    .bind()
    .await?;