Actually, it is surprisingly easy to abuse FTP...  and hammer the
server beyond all recognition.  I've seen it.  It's ugly.

A lot of FTP transfers get started... but never get past the login
phase.  It does one *bleep* of a job in gnawing at the pool of sockets
but isn't that friendly CPU-wise.  I didn't do enough deep diving in
the performance data whilst it was happening to see where those cycles
were going.

I forgot which Windoze client the customer was using when they spun
into a loop starting FTP sessions and not getting to the login portion
on one of our interchange servers.  I was surprised how little it took
to make other FTPs unable to be performed.

I have *no* idea if a "real" Linux (or Unix) based client can be made
to misbehave this way without some creative jiggery-pokery (you know
"doinking") with the source code.

-soup

--
John R. Campbell         Speaker to Machines          souperb at gmail dot com
MacOS X proved it was easier to make Unix user-friendly than to fix Windows

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