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Re: FTP denial of service attack
From: paulo () DCC UNICAMP BR (Paulo Licio de Geus)
Date: Thu, 9 Dec 1999 17:13:26 -0200


On Tuesday, 7December1999, Dustin Miller wrote:
FTP Voyager, for Win32, commonly uses one "login" session and then spawns
"download" sessions for each download you begin with a particular site.

I recently tried FTP Explorer (Windows), and in the past I used Fetch
on MacOS doing simultaneous transfers in both cases. On closer look it
seems those applications use the first ftp control connection for the
main window, and upon a file transfer request issue another ftp
control connection to handle that file transfer, including the ftp
data stuff.  I just transferred two large files at the same time under
FTP Explorer and observed 3 control connections and two data
connections (PASV mode).

--
Paulo Licio de Geus                 Internet: paulo () dcc unicamp br
Instituto de Computacao - UNICAMP   voice: +55 19 788-5865
Av. Albert Einstein, 1251           mobile (cel): +55 19 9117-6351
caixa postal: 6176                  fax: +55 19 788-5847
13083-970  Campinas SP Brazil       http://www.dcc.unicamp.br/~paulo



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