[bittorrent] modyfying announce URL in the binary torrent

Harold Feit - Depthstrike.com administrator dwknight at depthstrike.com
Fri Nov 11 15:02:45 EST 2005

Utilities to edit a torrent's announce url aren't uncommon, however I find
the option of setting an IP to Name mapping of a trackers internal IP to its
domain name using a hosts file (%windir%\system32\drivers\etc\hosts on
windows 2000/xp/2003, /etc/hosts on linux) is most effective in making sure
a seed who is using the same connection as the tracker can connect to the
swarm. Using the client's ability to specify an IP can be used to specify
the public IP of the client to the tracker so that inbound connections are
still possible.

The announce url itself doesn't really affect how the tracker and peers
identify the torrent, it just affects where the peers go looking for their
batches of other peers. 

-----Original Message-----
From: bittorrent-bounces at lists.ibiblio.org
[mailto:bittorrent-bounces at lists.ibiblio.org] On Behalf Of etienne deleflie
Sent: Friday, November 11, 2005 3:47 PM
To: bittorrent at lists.ibiblio.org
Subject: [bittorrent] modyfying announce URL in the binary torrent


has anyone heard of a system where once a torrent is submitted to a web 
site, it is copied and the announce URL is modified to point to 
'localhost' so that a client on the same machine as the tracker can then 
seed it?

Would it work if the seeder torrent is different (has dif anounce URL) 
to torrent that users download and launch?

Is their a small utility out there that can modify the announce URL 
(given that the torrent format is binary?)


>Hi Mitch,
>Thanks for posting the pointer ....... I eventually kind-of-solved my 
>problem by using a free public tracker, which so far has been quite 
>reliable.  I'm using http://www.bittorrent-support.com/. Just means I 
>cant have stats about my how many people have downloaded the torrents 
>(or maybe I can?).
>I'm not sure that your solution helps me though. Because in my use case 
>scenario, someone on the internet posts a torrent to my web site ..... 
>then I want my server to download it automatically.... so that it can 
>permanently seed it.  The torrent that they posted uses the announce URL 
>of my tracker (i.e. uses the static IP allocated to my server by my ISP)
>I dont have the means to get their torrent, read it, change the announce 
>URL (to use localhost instead of the outside IP) and seed it. At least I 
>dont think that is easily possible.  ... please enlighten me if it is.
>>Greetings Etienne,
>>I read about your problem with seeding from the same machine that your
>>tracker was located on:
>>I had the very same problem.  But I realized after reading the thread of
>>messages  that I needed to recreate my .torrent file.
>>My first .torrent file (which didn't work) was created this way:
>>btmakemetafile http://my.full.url:6969/announce /path/to/my/hugefile.iso
>>The solution was to create my .torrent file using "localhost" rather
>>than my full URL:
>>btmakemetafile http://localhost:6969/announce /path/to/my/hugefile.iso
>>Now, my local seed client is able to respond properly to external
>>bittorrent clients!
>>I hope this helps.  Thanks for posting your question in the first
>>place.  If you hadn't, I wouldn't have figured out how to solve my
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