You won’t find a one-click button that will disable or even slow BitTorrent traffic on your entire home network. In summary, there’s no easy technical solution.
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How to Stop (or Slow) BitTorrent on Your Network As you might expect, BitTorrent’s juggling of ports and protocol encryption features get in the way of your home router identifying BitTorrent traffic, too. Some routers come with Quality of Service (QoS) features that attempt to identify types of traffic and let you throttle them on your network. This is designed to “obfuscate” BitTorrent traffic, making it harder for ISPs and network operators to detect that BitTorrent traffic and perform traffic shaping on it-in other words, making it much more difficult for ISPs to pin down and slow BitTorrent traffic. This may be known as Protocol Encryption (PE) or Protocol Header Encryption (PHE), depending on which BitTorrent client you’re using. Unsurprisingly, that led the BitTorrent protocol to grow another feature: encryption.
You Can’t Use Traffic Inspection Due to Encryptionįaced with BitTorrent clients that mostly no longer ran on predictable ports, ISPs and other network operators turned to something called “deep packet inspection.” Rather than simply checking for the port associated with a network packet and throttling or blocking those packets, they could examine all network packets for the characteristics of BitTorrent traffic, identifying those packets associated with BitTorrent and throttling or blocking those. When using DHT, BitTorrent clients communicate over UDP, negotiating, and using different ports for each connection.Īnd, while you could disable UPnP on your router to prevent BitTorrent clients from automatically forwarding ports to allow incoming connections, they could still make outgoing connections. On top of that, modern BitTorrent clients use an extension called DHT (“distributed hash table”), which means they don’t even need to rely on a centralized tracker that can be blocked-they can exchange information in a peer-to-peer fashion. Modern BitTorrent clients often have built-in options to use a random port, helping evade detection.
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Some BitTorrent trackers have banned BitTorrent clients using these ports from connecting, reasoning that these clients could slow down the overall download speed for the swarm.Įven back in those days, anyone could change the port used by their BitTorrent client to another one and evade the ban. Many began throttling (slowing) all traffic using these ports. Internet service providers and other network providers caught on. When BitTorrent was first released back in 2001, the standard ports it ran on were TCP ports 6881 through 6889.
These tricks that help BitTorrent evade throttling by ISPs will also help it evade blocking on your home network. It’s no surprise, then, that BitTorrent has gradually evolved to be much harder to block and throttle. Even internet service providers like Comcast have gone out of their way to throttle BitTorrent traffic, slowing the protocol for their customers. The BitTorrent protocol has had a target painted on its back for much of its history. BitTorrent Evades Blocking and Throttling There’s no switch you can flick to block just one type of traffic, and BitTorrent has evolved to make this even more difficult. It’s not just blocking a single website-you’d have to block a specific protocol a computer on your network uses for peer-to-peer communication with other computers around the world.