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Merge the minimum-rate scanning feature (--min-rate) from

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/nmap-exp/david/nmap-fixed-rate.
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david
2008-03-26 02:41:32 +00:00
parent dd220398b1
commit feab94ebd3
8 changed files with 351 additions and 14 deletions
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38
docs/refguide.xml
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@@ -2300,6 +2300,44 @@ threshold based intrusion detection and prevention systems (IDS/IPS).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>--min-rate &lt;number&gt;</option>
(Specify a minimum scanning rate)
<indexterm><primary>--min-rate</primary></indexterm>
</term>
<listitem>
<para>Nmap's dynamic timing does a good job of finding an appropriate
speed at which to scan. Sometimes, however, you may happen to know an
appropriate speed for a network, or you may have to guarantee that a
scan will be finished by a certain time. When the
<option>--min-rate</option> is given Nmap will do its best to send
packets as fast or faster than the given rate. The argument is a
positive real number representing a packet rate in packets per second.
For example, using <command>--min-rate 300</command> will ensure that
the packet sending rate doesn't fall below 300 packets per second.
Specifying a minimum rate does not keep Nmap from going faster if
conditions warrant.</para>
<para>There are two conditions when the actual scanning rate may fall
below the specified minimum. The first is if the minimum is faster than
the fastest rate at which Nmap can send, which is dependent on hardware.
In this case Nmap will send packets as fast a possible, but be aware
that such high rates are likely to cause a loss of accuracy. The second
case is when Nmap has nothing to send, for example at the end of a scan
when the last probes have been sent and Nmap is waiting for them to time
out or be responded to. It's normal to see the scanning rate drop at the
end of a scan or in between groups of hosts.</para>
<para>The <option>--min-rate</option> option is global, affecting an
entire scan, not individual hosts. It only affects port and host
discovery scans. Other features like OS detection implement their own
timing.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--defeat-rst-ratelimit</option>
<indexterm><primary>--defeat-rst-ratelimit</primary></indexterm></term>