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5] R. Stewart, “Stream Control Transmission Protocol,” RFC 4960, Sept. 2007. [6] R. , “Stream Control Transmission Protocol (SCTP) Dynamic Address Reconfiguration,” RFC 5061, Sept. 2007. [7] M. Riegel and M. Tüxen, “Mobile SCTP Transport Layer Mobility Management for the Internet,” Proc. SoftCOM 2002, Int’l. Conf. Software, Telecommunications and Computer Networks, Split, Croatia, 2002, pp. 305–09. [8] B. Ford and P. , Anaheim, CA, Apr. 2005. [9] R. Stewart and Q. Xie, Stream Control Transmission Protocol (SCTP): A Reference Guide, Addison-Wesley, Oct.

Appears as if the client has an additional IP address. After the association is established, the client adds its secIn Fig. 5 the upper route shows the path where the associaond address by sending an ASCONF chunk. If the packet tion was set up initially. After the route was changed, the containing this chunk is sent via the path containing NAT 2, packets travel on the lower route. An example for the both NAT middleboxes have the required state. If this packet address/port combination for both routes is shown below the is sent on the path via NAT 1, any packet sent from the client server.

Hubs frequently receive advertisement messages from a large set of different nodes, so they frequently update their cache. In particular, if advertisement messages contain nodes that are low in popularity, hubs can discover peers, which being low in popularity, are lightly loaded with high probability. The key is to make searches through hubs because they potentially know a large variety of lightly loaded peers. Thus, the proposed solution essentially exploits — and IEEE Network • September/October 2008 CIMINIERA LAYOUT 9/5/08 1:03 PM Page 35 A joining connectivity peer with no entries in cache queries the bootstrap service for some hubs CP CP CP CP CP CP CP CP Bootstrap service CP CP CP CP The UA behind NAT queries a node (possibly a hub) for service CP CP NAT CP CP UA A CP = Highly popular connectivity peer (hub) CP = Connectivity peer ■ Figure 1.

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