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Firewall Testing About VESARiA |
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C.7 What software uses what FTP mode?
It is up to the client to decide what mode to use; the default mode
when a new connection is opened is ``active mode''.
Most FTP clients come preconfigured to use active mode, but provide an
option to use ``passive'' (``PASV'') mode. An exception is the
windows command line FTP client which only operates in active mode.
Web Browsers generally use passive mode when connecting via FTP, with
a weird exception: MSIE 5 will use active FTP when FTP:ing in ``File
Explorer'' mode and passive FTP when FTP:ing in ``Web Page'' mode.
There is no reason whatsoever for this behaviour; my guess is that
someone in Redmond with no knowledge of FTP decided that ``Of course
we'll use active mode when we're in file explorer mode, since that
looks more active than a web page''. Go figure.
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Vesaria
722 Dulaney Valley Road, Suite 192
Towson, MD 21204
443 - 501 - 4044
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