Also: link to draft DHT protocol (dead link), Web Archive Copy () of draft DHT protocol. How BitTorrent Works about P2P in general, BitTorrent and firewall settingsĭHT Protocol (BEP 5), the UDP-based BitTorrent extension for distributed trackers (the UDP port number is negotiated). (a bug in the libpcap optimizer in libpcap 0.8.x means this won't work with libpcap 0.8.x, although you might be able to use tcpdump with the "-O" flag). When using libpcap 0.9.1 or later or WinPcap 3.1 or later that expression won't work with older versions of libpcap or WinPcap, so, on Windows, upgrade to WinPcap 3.1 or later and, on UN*X, upgrade to libpcap 0.9.x if possible and, if not possible and you have a version of libpcap prior to 0.8.1, use (tcp >= 6881 and tcp = 6881 and tcp <= 6889) 6881): tcp port 6881Ĭapture the BitTorrent tracker traffic over the range of default ports (e.g. However, if you know the TCP port used (see above), you can filter on that one.Ĭapture only the BitTorrent tracker traffic over one of the default ports (e.g. You cannot directly filter BitTorrent protocols while capturing. Note: implemented in Wireshark post 0.10.12! Capture Filter Show only the BitTorrent based traffic: bittorrent Display FilterĪ complete list of BitTorrent display filter fields can be found in the display filter reference SampleCaptures/BITTORRENT.pcap (libpcap) Capture file of two torrent clients communicationg without DHT or peer exch. SampleCaptures/ (Microsoft Network Monitor) Here's a capture with a few BitTorrent packets it contains some small packets I got whilst downloading something on BitTorrent. Reassemble BitTorrent messages spanning multiple TCP segmentsĭecode the peer_id of the handshake messages The uTP extension has been supported since r36716. The DHT extension has been supported since r39653. The BitTorrent dissector is (fully functional, partially functional, not existing, … whatever the current state is). XXX - Add example traffic here (as plain text or Wireshark screenshot). The DHT extension (peer2peer tracker) uses various UDP ports negotiated by the peers. The well known TCP port for BitTorrent traffic is 6881-6889 (and 6969 for the tracker port).
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