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I'm a noob, and I'm starting to learn about webRTC, recently I found a web page called simplewebrtc, I read about the demo, but I don't understand how they manage the firewalls and NAT traversal in a network, I know that webRTC uses STUN Servers but I can't find them in the source code of the demo from simplewebRTC, can anybody explain me that please?

Thank you

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Currently SimpleWebRTC uses the public google STUN server as default, check this line.

About the NAT/firewall traversal: as you already pointed out this is done using a STUN (or TURN) server. The STUN protocol simply allows clients that are trying to establish a connection to discover each others public IPs, with which they can establish direct connections. If some client is behind a symmetric NAT then a TURN server that acts as a relay will be necessary.

You can find a more detailed explanation about STUN/TURN here.

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