Re: Azureus and the TCP port 6881

Andrew Sackville-West wrote:
>>1) Don't use port 6881. Pick something random in the 49152-65535 range.
>
> Are you suggesting this for a reason? or just for diagnostic purposes. I don't do much with torrent, but once in a whileI do and it never seems to quite work very well. and yes I port forward something like 6881-6999 or some such. just curious

I've already replied to that question on this thread.

But basically it makes it harder for ISPs to censor p2p traffic, as they've
started doing of late. If everyone picks a random port in the unassigned port
range (49152-65535) there's not a whole lot the ISPs can do short of block the
whole range, which would in turn break a lot of things.

IMO a good solution to ISPs censoring bittorrent traffic would be to have all
traffic (tracker and data) wrapped in TLS or SSL and have the port number
change every tracker update. The last random port would be left open for
clients that hopped aboard the tracker right before the last update.

E.g. when a torrent is started, pick a random port A in the unassigned range,
open it for traffic and notify the tracker. At the next update, pick a new
port B, open that one and send the new port to the tracker. Next update pick
yet another port C, open that one, inform the tracker of port C and close port
A. Next update, open D, give D to the tracker, close B, and so on. Everyone's
happy, providing that every client updates on roughly the same schedule.

Watch ISPs try to filter that. The TLS/SSL wrapper keeps them from filtering
by analyzing the protocol.

--
Chris Howie
http://www.chrishowie.com

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