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Wow, seems like a big privacy issue. Does this mean that VPNs soon won't be effective for masking your IP?

No. Your public IP has always been available to a Javascript developer who knows enough to write a one-line PHP script that prints $_SERVER['REMOTE_ADDR'] (as an example). This just makes it available via another protocol.

The new bit is that you can now get local IPs. But that doesn't help someone trying to figure out if you're using a VPN.

> Your public IP has always been available to a Javascript developer who knows enough to write a one-line PHP script that prints $_SERVER['REMOTE_ADDR'] (as an example).

The demo shows both my USA VPN IP address and my China Telecom IP address under "public addresses" (I strongly doubt this was possible before WebRTC). This means that Hulu, YouTube, Netflix etc. can now start blocking me even when I'm behind a VPN.

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