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Changed the default port for UDP probing. Also changed the ICMP id in ICMP

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pinging to be a nonzero number.
This commit is contained in:
josh 2009-06-05 03:29:10 +00:00
parent d011afb07c
commit 881fc1777f
4 changed files with 17 additions and 4 deletions
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4
docs/refguide.xml
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@ -611,7 +611,7 @@ you would expect.</para>
specified) UDP packet to the given ports. The port list
takes the same format as with the previously discussed
<option>-PS</option> and <option>-PA</option> options. If
no ports are specified, the default is 31338. This default
no ports are specified, the default is 40125. This default
can be configured at compile-time by changing
<varname>DEFAULT_UDP_PROBE_PORT_SPEC</varname><indexterm><primary><varname>DEFAULT_UDP_PROBE_PORT_SPEC</varname></primary></indexterm>
in <filename>nmap.h</filename>.<indexterm><primary><filename>nmap.h</filename></primary></indexterm>
@ -627,7 +627,7 @@ you would expect.</para>
a down or unreachable host. A lack of response is also
interpreted this way. If an open port is reached, most
services simply ignore the empty packet and fail to return
any response. This is why the default probe port is 31338,
any response. This is why the default probe port is 40125,
which is highly unlikely to be in use. A few services, such
as the Character Generator (chargen) protocol, will respond to an empty UDP packet, and thus
disclose to Nmap that the machine is available.</para>