![]() We assume each NATed peer to be connected by TCP to a number of conveyance peers. The UDP puncturing and conducts error handling. This temporary control channel is relayed through a conveyance peer which coordinates To simplify NAT traversal our approach is to first establish a TCP control channel. Implementation details Relay architecture and protocol The effectiveness of various connection setup strategies that employ holy punching techniques.Overview of types of NATs seen by Tribler.The implementation will result in various data points. Use a connection setup strategy to setup a connection.Connect to other peer using a relay connection.The current research is focuses on UDP holepunching. ![]() In order to set up connections across NAT/firewalls, TCP and UDP holepunching can be used. ![]() This concept is explored in the next section. Holepunching manipulates the behavior of NAT/firewall to setup a direct connection. Instead we will explore a different solution which is based on the concept of holepunching. However the availability of these solutions our outside the control of the Tribler application. Using Application Layer Gateways (ALGs) in de NAT/firewall to allow incoming connections to pass through.Using UPnP forwarding rules can be set up on a NAT/fw to allow incoming connections towards the peer. This requires user intervention in the NAT/fw. The ability to set up static rules to allow for incoming connections to peers located behind the NAT/fw.In order to setup connections to peers located behind a NAT/firewall, various solutions have been implemented in NAT/firewalls: NOTE: it is possible for a peer to be connected to the internet through a cascade of multiple NAT/fw's. Neither peer can setup a connection to the other peer. Both peers are located behind a NAT/firewall.Only peer A is able to set up a connection to B, the reverse is not possible. One peer is located behind a NAT/firewall, the other is connected directly to the internet.Both peers can setup a direct connection to each other. Both peers are connected directly to the internet.The actual situation depends on the way the peers are connected to the internet. However in practice it turns out that it is not always possible. In order to optimize performance, it is preferable if each peer could setup a direct connection to every other peer in the swarm. Initially this was explored in remko_1035363_Onderzoekstaak_-_Final_Version.pdf. These traversal techniques will become a feature of IPv8. Implementing these techniques in Tribler will significantly enhance performance, since it will allow the swarm to tap into previously unavailable resources. ![]() We have investigated various techniques and tricks to be able to interact with these peers as if they were directly connected to the Internet. With the increasing shortage of IP-address space and rising security concerns, more and more users will access the Internet from behind a Network Address Translator (NAT) or firewall. In short: the ability for peers to set up connections to other peers located behind NATs and Firewalls. ![]()
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