Why peers cannot discover each other?

[ghost]

Code here: https://github.com/SightNet/sightnet-app/blob/master/src/app.rs
Logs:

Local node is listening on /ip4/127.0.0.1/udp/48367/quic-v1
Local node is listening on /ip4/xxx.xxx.xxx/udp/48367/quic-v1
Local node is listening on /ip4/xxx.xxx.xxx/udp/48367/quic-v1
Local node is listening on /ip4/127.0.0.1/tcp/36085
Local node is listening on /ip4/xxx.xxx.xxx/tcp/36085
Local node is listening on /ip4/xxx.xxx.xxx/tcp/36085

But if i start two instances, they won't discover each other(so, i can send messages: Publish error: InsufficientPeers)
Later, it worked.
I tried also official example: https://github.com/libp2p/rust-libp2p/blob/master/examples/chat-example/.
Also i tried to change versions of library in example.
And there is the same problem.
If it is important, i use vpn connection.

[thomaseizinger]

Are your peers on the same network? The chat example uses mDNS for discovery which will only work on the local network.

[ghost]

So, i have just built and run sightnet-app on my mobile(via termux) and it works fine.

[thomaseizinger]

What OS are you running on your desktop?

[ghost]

What OS are you running on your desktop?

EndeavourOS

[thomaseizinger]

Can you somehow verify whether mDNS works on your machine at all?

It relies on multicast so if that is disabled for example then things won't work.

[ghost]

I am stupid. Just installed avahi and disabled firewall and problem disappeared... Thank you.