NAT / Firewalls cause a lot of issues. Peer to peer data isn't as straightforward as you'd expect. The Skype people actually came from Kazaa, so they had a lo

NAT / Firewalls cause a lot of issues. Peer to peer data isn't as straightforward as you'd expect. The Skype people actually came from Kazaa, so they had a lot of experience with sending peer data across corporate / educational firewalls. WebRTC is trying to generalize the technology, but it's new.