locally-discovered-nodes cannot discover each other on the same wi-fi hub

[lcp2000k]

For example, the locally-discovered-nodes can discover each other when two instances are opened on the same computer. However, when each computer on the same Wi-Fi hub opens one instance, they cannot discover each other. Please confirm if there is a bug somewhere.

[matheus23]

We don't know of a bug.

On some Wifis, IP multicast is disabled. This depends on the Wifi router. Unfortunately the discovery-local-network feature of iroh will only produce results when you're connected to a Wifi router that supports IP multicast.

Your OS can "intercept" IP multicast packages and decide to send them to local listeners, which is presumably why you're seeing it work locally.

[lcp2000k]

I tested the open-source project rust-libp2p (mdns) and the open-source project mdns-sd in the same Wi-Fi hub environment, and nodes on different computers can discover each other. How does iroh's mDNS differ from these, and have there been any optimizations considered?

[matheus23]

Great. I'm not familiar with how rust-libp2p's mdns nor mdns-sd work, so I can't comment on differences.
(We use the swarm-discovery crate for iroh.)
You can try turning on logging using the tracing_subscriber crate and see if there's anything useful in the logs.