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Update the documentation for the -F option in the reference guide.

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david
2008-09-23 21:19:16 +00:00
parent 6e79e2c419
commit 9b01592e12
1 changed files with 15 additions and 13 deletions
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28
docs/refguide.xml
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@@ -1577,19 +1577,21 @@ way.</para>
<indexterm significance="preferred"><primary><option>-F</option></primary></indexterm>
</term>
<listitem>
<para>Specifies that you only wish to scan
for ports listed in the <filename>nmap-services</filename>
file which comes with Nmap (or the protocols file for
<option>-sO</option>). This is much faster than scanning all 65535 ports on a
host. Because this list contains so many TCP ports (more
than 1200), the speed difference from a default TCP scan
(about 1650 ports) isn't dramatic. The difference can be
enormous if you specify your own tiny
<filename>nmap-services</filename> file using the
<option>--servicedb</option><indexterm><primary><option>--servicedb</option></primary></indexterm>
or <option>--datadir</option><indexterm><primary><option>--datadir</option></primary></indexterm>
options.
</para>
<para>Specifies that you wish to scan fewer ports than the
default. Normally Nmaps scans the most common 1,000 ports for
each scanned protocol. With <option>-F</option>, this is
reduced to 100.</para>
<para>Nmap needs an <filename>nmap-services</filename> file
with frequency information in order to know which ports are
the most
common<notman> (see <xref linkend="nmap-services"/>
for more about port frequencies)</notman>. If port frequency
information isn't available, perhaps because of the use of a
custom <filename>nmap-services</filename> file,
<option>-F</option> means to scan only ports that are named in
the services file (normally Nmap scans all named ports plus
ports 1&ndash;1024).</para>
</listitem>
</varlistentry>