[bittorrent] Why multiple listen ports?

Harold Feit - Depthstrike.com administrator dwknight at depthstrike.com
Fri Nov 18 15:59:25 EST 2005


Actually, the number of clients using one listen port per active torrent
(which was originally used due to process tracking concerns) is going down.

ABC, Azureus, BitComet, BitSpirit, uTorrent, and several others all use 1
listen port now.

ABC, Azureus, BitComet, BitSpirit (I think, haven't checked), uTorrent, and
BitTornado support UPnP forwarding. 

-----Original Message-----
From: bittorrent-bounces at lists.ibiblio.org
[mailto:bittorrent-bounces at lists.ibiblio.org] On Behalf Of Kenneth Porter
Sent: Friday, November 18, 2005 4:54 PM
To: BitTorrent
Subject: [bittorrent] Why multiple listen ports?

IIRC, a BT client listens on a block of ports typically starting at 6881. 
Why multiple ports?

BTW, are there any BT clients that use UPnP to dynamically set up port 
forwarding so that they can work automatically behind NAT?
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