Xunlei/Thunder is a Chinese multi-protocol download manager. It uses several DDL websites and P2P protocols to retrieve files. This plug-in only classifies Thunder-specific P2P protocols, and miscellaneous HTTP/HTTPS traffic related to the Xunlei/Thunder application. Downloads made by the application from public HTTP or FTP websites won't be classified as thunder, but as http and ftp_data for most of them. The usage of third party P2P protocols won't be classified as thunder, but as bittorrent or edonkey instead. UDP classification of Thunder/Xunlei streams is extended using DNS Caching.