Network Address Translation (NAT) causes well-known difficulties for peer-to-peer (P2P) communication, since the peers involved may not be reachable at any globally valid IP address.
M. Wander, S. Holzapfel, A. Wacker, и T. Weis. 9th IEEE Consumer Communications and Networking Conference, CCNC 2012, Las Vegas, Nevada, USA, (14 - 17 01 2012)