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Peer-To-Peer (P2P) overlay networks are the foundation of a significant number of today's most popular Internet applications, such as distributed file sharing, streaming videos, or Internet telephony. The current IPv4 protocol, however, has significant drawbacks within the P2P context: firstly, extensive use of Network Address Translation (NAT) mechanisms hinders direct connectivity between arbitrary peers. Secondly, this impedes also discovery of P2P members in order to initially join such a P2P network, commonly referred to as the bootstrapping problem. The first drawback is overcome by IPv6's sufficiently large address space and the lacking need for using IPv6-NATs. An efficient solution for the second problem based on the innovative features of IPv6 is discussed in this paper.
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