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> 100% peer-to-peer.

Is this even possible with WebRTC? How do clients initially learn about each other's IP addresses and ports?

There seems to be some logic to facilitate that in the server code: https://github.com/vasanthv/talk/blob/master/server.js

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I agree, this is super cool but it's not 100% peer to peer as WebRTC requires a central server to establish the connection as far as I know.

Is LAN P2P? If yes, WebRTC is 100% P2P over LAN is it not?

I still think the clients need a coordination server to discover each other (won't use multicast/broadcast traffic). You could probably make a browser that does this, but if they already do then I am not aware of it.

It does not require a central server, signaling is left as an implementation detail. Implement a p2p signaling system, and that will be p2p.

Signaling is up to the implementation. You can use carrier pigeons if you want. Would that qualify as p2p? :)

Pigeon-to-pigeon connection establishment, I like it :)

I've never considered using WebRTC without STUN or TURN, but apparently it's quite possible, enabling LAN-only usage: https://stackoverflow.com/questions/30742431/webrtc-on-isola...

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