You can build filter with common filter and udp .
Also you need something like nDPI , to mark packets or using something like CISCO NBAR to mark packets

On 27/01/14 11:35, Adrian Popa wrote:
The problem with bittorrent is that it's not using a static port for communication. There are some known ports for communicating with the tracker, but actual data transfer is usually done on non-known ports. That's why it's hard to identify and filter without deep packet inspection.

You can go the other way - mark all well-known traffic (web, mail, rtsp, video) and the rest will contain torrent.


On Mon, Jan 27, 2014 at 2:09 AM, Daniel Lazkani Feferman <d_fe...@hotmail.com <mailto:d_fe...@hotmail.com>> wrote:



    Hi,

    How can i filter only the ports used by torrent or bitorrent with
    nfsen?

    thanks.

    
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