Nmap 7.94

[FunkyBuddha]

Windows

While Nmap was once a Unix-only tool, a Windows version was released in 2000 and has since become the second most popular Nmap platform (behind Linux). Because of this popularity and the fact that many Windows users do not have a compiler, binary executables are distributed for each major Nmap release. We support Nmap on Windows 7 and newer, as well as Windows Server 2008 and newer. We also maintain a 

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. While it has improved dramatically, the Windows port is not quite as efficient as on Unix. Here are the known limitations:

• Nmap only supports ethernet interfaces (including most 802.11 wireless cards and many VPN clients) for raw packet scans. Unless you use the -sT -Pn options, RAS connections (such as PPP dialups) and certain VPN clients are not supported. This support was dropped when Microsoft removed raw TCP/IP socket support in Windows XP SP2. Now Nmap must send lower-level ethernet frames instead.

• When using Nmap without Npcap, you cannot generally scan your own machine from itself (using a loopback IP such as 127.0.0.1 or any of its registered IP addresses). This is a Windows limitation that we have worked around in Npcap, which is included in the Windows self-installer. Users stuck without a Npcap installation can use a TCP connect scan without pinging (-sT -Pn) as that uses the high level socket API rather than sending raw packets.

Scan speeds on Windows are generally comparable to those on Unix, though the latter often has a slight performance edge. One exception to this is connect scan (-sT), which is often much slower on Windows because of deficiencies in the Windows networking API. This is a shame, since that is the one TCP scan that works over all networking types (not just ethernet, like the raw packet scans). Connect scan performance can be improved substantially by applying the Registry changes in the nmap_performance.reg file included with Nmap. By default these changes are applied for you by the Nmap executable installer. This registry file is in the nmap-<version> directory of the Windows binary zip file, and nmap-<version>/mswin32 in the source tarball (where <version> is the version number of the specific release). These changes increase the number of ephemeral ports reserved for user applications (such as Nmap) and reduce the time delay before a closed connection can be reused. Most people simply check the box to apply these changes in the executable Nmap installer, but you can also apply them by double-clicking on nmap_performance.reg, or by running the command regedt32 nmap_performance.reg. To make the changes by hand, add these three Registry DWORD values to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters:

MaxUserPort

Set a large value such as 65534 (0x0000fffe). See 

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.

TCPTimedWaitDelay

Set the minimum value (0x0000001e). See 

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.

StrictTimeWaitSeqCheck

Set to 1 so TCPTimedWaitDelay is checked.

 

Info:

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Nmap and Npcap Links:

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