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4 Décembre 2020
Npcap is the Nmap Project's packet sniffing (and sending) libraryfor Windows. It is based on thediscontinued WinPcap library,but with improved speed, portability, security, and efficiency. Inparticular, Npcap offers:
For a simple loopback test (marked red in Fig. 2,3 below), you connect: pins 2 and 3 for RS-232; pins 4 to 8 and 5 to 9 for RS-422/485. For a loopback test with a hardware flow control (marked blue in Fig. 2,3), you connect: pins 4 to 6 (DTR/DSR hardware flow control) and 7 to 8 (RTS/CTS hardware flow control) for RS-232.
Unsure whether to use WinPcap or Npcap? Check out our feature comparison and decide for yourself.
The free version of Npcap may be used (but not externally redistributed) on up to 5 systems (free license details). It may also be used on unlimited systems where it is only used with Nmap and/or Wireshark. Simply run the executable installer. The full source code for each release is available, and developers can build their apps against the SDK. The improvements for each release are documented in the Npcap Changelog.
The latest development source is in our Github source repository.Windows XP and earlier are not supported; you can use WinPcap for these versions.
We fund the Npcap project by selling Npcap OEM. This special version of Npcap includes enterprise features such as the silent installer and commercial support as well as special license rights allowing customers to redistribute Npcap with their products or to install it on more systems within their organization with easy enterprise deployment. The Npcap free license only allows five installs (with a few exceptions) and does not allow for any redistribution. We offer two commercial license types:
Npcap OEM Redistribution License: The redistribution license is for companies that wish to distribute Npcap OEM within their products (the free Npcap edition does not allow this). Licensees generally use the Npcap OEM silent installer, ensuring a seamless experience for end users. Licensees may choose between a perpetual unlimited license or an annual term license, along with options for commercial support and updates. [Redistribution license details]
Npcap OEM Internal-Use License: The corporate internal license is for organizations that wish to use Npcap OEM internally, without redistribution outside their organization. This allows them to bypass the 5-system usage cap of the Npcap free edition. It includes commercial support and update options, and provides the extra Npcap OEM features such as the silent installer for enterprise-wide deployment. [Internal-use license details]
The primary documentation for Npcap is the Npcap User's Guide. You can also refer to the README file on Github. The changes in each new release are documented in the Npcap Changelog.
Questions, comments and bug reports are always welcome. Please use the Nmapdevelopment mailing list (nmap-dev). To subscribe, please visit:http://nmap.org/mailman/listinfo/dev.
Code patches to fix bugs are even better than bug reports. Instructions forcreating patch files and sending them are available here.
Bug reports for Npcap can also be filed on the Nmap bug tracker.
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If you are working on a network you are going to see some IPv6 traffic and it can get quite confusing. A 'loopback' is an address that causes the traffic to be sent to the same interface is was sent out on on the localhost.
Usage of loopback addresses are particularly popular with developers and anyone in IT performing network tests. For instance, if you think your Network Card is failing you can try:
PING 127.0.0.1
and if you don't see a reply with a TIME<1ms, your card or TCP/IP stack likely has a problem. If you are on a PC that supports IPv6 (all Windows 10, 8, 7 and Vista PC's), you can try the same test using:
PING ::1
Rapid note v2 0. Below are all of the loopback IP addresses:
Below is a table of all the ‘Special Use' IP Ranges:
0.0.0.0/8 'This' Network
10.0.0.0/8 Private-Use Networks
14.0.0.0/8 Public-Data Networks
24.0.0.0/8 Cable Television Networks
39.0.0.0/8 Reserved, subject to allocation
127.0.0.0/8 Loopback
128.0.0.0/16 Reserved, subject to allocation
169.254.0.0/16 Link Local
172.16.0.0/12 Private-Use Networks
191.255.0.0/16 Reserved, subject to allocation
192.0.0.0/24 Reserved but subject to allocation
192.0.2.0/24 Test-Net
192.88.99.0/24 6to4 Relay Anycast
192.168.0.0/16 Private-Use Networks
198.18.0.0/15 Network Interconnect Device Benchmark Testing
223.255.255.0/24 Reserved, subject to allocation
224.0.0.0/4 Multicast, commonly used in multiplayer simulations and gaming and for video distribution.
240.0.0.0/4 Reserved for Future Use
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