Abstract: In order to provide security within a peer-to-peer network (100) comprising common peers (0, 7, 10, 15, 20, 28) providing the functionality of the network (100), at least one police peer (4, 9, 23) is added to the network (100), said at least one police peer (4, 9, 23) providing security within the network (100) and being certified by a central certification authority (110) managing the certification and positioning of the peers (0, 4, 7, 9, 10, 15, 20, 23, 28).

Abstract: The invention concerns method of establishing a connection in a peer-to-peer network (160), and a peer, a telecommunication infrastructure comprising the peer-to-peer network (160), and a computer program product to execute said method. The connection is established between a first peer (61) in a first address realm of the peer-to-peer network (160) and a second peer (62) in a second address realm of the peer-to-peer network (160). In the peer-to-peer network (160), a network address translation is discovered which prevents a direct connection between the first peer (61) and the second peer (62). A third peer of the peer-to-peer network (160) is determined as a relay peer (R). The relay peer (R) relays the connection between the first peer (61) and the second peer (62).

Abstract: In order to provide security within a peer-to-peer network (100) comprising common peers (0, 7, 10, 15, 20, 28) providing the functionality of the network (100), at least one police peer (4, 9, 23) is added to the network (100), said at least one police peer (4, 9, 23) providing security within the network (100) and being certified by a central certification authority (110) managing the certification and positioning of the peers (0, 4, 7, 9, 10, 15, 20, 23, 28).