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It really depends on your traffic. I had a low traffic site, and never had any problems with only 30 ports open. If you have a moderately busy site you'll probably need a few hundred. Start out with a small number, see if you have problems, and if you do, add more.
the last two are: p1 and p2 from RFC of ftp: http://www.faqs.org/rfcs/rfc959.html
to get port, use:
p1 * 256 + p2, then connect to this port
the port number is a 16-bit value between 0 and 65535 due to some constraints the authors have decided that all numbers between commas should be 8-bit (between 0 and 255). Thus, the 16-bit port number is represented with 2 8-bit numbers.
In your case the port number will be 230 * 256 + 205 = 59085
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