entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://snapcraft.io/|blocks|key|cpk16|text|在我的例子中，这个错误是由通过Snap安装nmap引起的。|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|8g5a1|为了让nmap正常工作，我不得不让snap把它连接到network-control：|fi05v|sudo+snap+connect+nmap:network-control|code-block|syntax|javascript|dpg2h|在那之后，一切都运行得很好。|1pbh6^0|L|4|F|4|0|0|0|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|W|G|@$H|X|I|Y|J|K]]|L|@$H|Z|I|10|A|11]]|6|$]]|$A|M|C|N|2|E|F|12|G|@]|L|@]|6|$]]|$A|O|C|P|2|Q|F|13|G|@]|L|@]|6|$R|S]]|$A|T|C|U|2|E|F|14|G|@]|L|@]|6|$]]|$A|V|C|-4|2|E|F|15|G|@]|L|@]|6|$]]]]

In my case, the error was caused by <code>nmap</code> being installed through <a href="https://snapcraft.io/" rel="nofollow noreferrer">Snap</a>.
In order to get nmap to work, I had to tell snap to connect it to the network-control:
<pre><code>sudo snap connect nmap:network-control
</code></pre>
After that everything worked fine.

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://nmap.org/dist/nmap-7.80-setup.exe|1|https://nmap.org/npcap/dist/npcap-0.9986.exe|blocks|key|eoer0|text|安装nmap-7.80-setup.exe后，请安装与最新Windows10版本完全兼容的npcap-0.9986.exe。|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|9l94n^0|2|J|0|19|G|1|0^^$0|$1|$2|3|4|5|6|$7|8]]|9|$2|3|4|5|6|$7|A]]]|B|@$C|D|E|F|2|G|H|N|I|@]|J|@$K|O|L|P|C|Q]|$K|R|L|S|C|T]]|6|$]]|$C|M|E|-4|2|G|H|U|I|@]|J|@]|6|$]]]]

After installing <a href="https://nmap.org/dist/nmap-7.80-setup.exe" rel="nofollow noreferrer">nmap-7.80-setup.exe</a>, install please install <a href="https://nmap.org/npcap/dist/npcap-0.9986.exe" rel="nofollow noreferrer">npcap-0.9986.exe</a> which is fully compatible with latest Windows 10 releases.

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://nmap.org/npcap/#download|blocks|key|bg6ko|text|您可以尝试执行以下操作:+nmap+(IP)接口(波多黎各)+-P+(ethX)或从常用的https://nmap.org/npcap/#download页安装npcap|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|2ucjj^0|19|W|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|L|G|@]|H|@$I|M|J|N|A|O]]|6|$]]|$A|K|C|-4|2|E|F|P|G|@]|H|@]|6|$]]]]

You can try this: nmap (IP) -P (puerto) --interface (ethX)
or install npcap from oficially page <a href="https://nmap.org/npcap/#download" rel="nofollow noreferrer">https://nmap.org/npcap/#download</a>

entityMap|blocks|key|e3d18|text|如果您也在同一台计算机上使用Nessus，则无法使用nmap。Nessus将使用NPCAP，NMAP也需要使用NPCAP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|e7ar9^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|D|9|@]|A|@]|B|$]]|$2|C|4|-4|6|7|8|E|9|@]|A|@]|B|$]]]]

If you are using Nessus also in the same machine, you are not able to use nmap. NPCAP will be used by Nessus and same is required for NMAP as well.

entityMap|blocks|key|7dfde|text|TLDR:使用--unprivileged+nmap选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|c6se7|当我在Windows8.1和Windows7中通过Wireguard+0.3.14隧道扫描/测试主机时，我刚刚遇到了同样的问题，使用的是最新的可用版本nmap+7.91，npcap+1.31。尝试了几种解决方案/组合，以管理员身份运行，重新安装等，除了降级到Winpcap+4.1.3+(最后一个可用)，结果相同：|2uur7|C:\Windows\system32>nmap+-n+-P0+-p+22+192.168.20.1
Host+discovery+disabled+(-Pn).+All+addresses+will+be+marked+'up'+and+scan+times+will+be+slower.
Starting+Nmap+7.91+(+https://nmap.org+)+at+2021-06-08+13:28+Hora+de+verano+central+(México)
dnet:+Failed+to+open+device+eth0
QUITTING!|code-block|syntax|javascript|3tked|奇怪的是，nmap+--iflist的接口列表没有显示与eth0相关的设备名称(也没有显示MAC地址，可能是Wireguard接口驱动程序安装/钩子出错)。相关行：|offset|length|style|CODE|6be66|C:\Windows\system32>nmap+--iflist
Starting+Nmap+7.91+(+https://nmap.org+)+at+2021-06-08+13:32+Hora+de+verano+central+(México)
************************INTERFACES************************
DEV++(SHORT)+IP/MASK++++++++++++++++++++++TYPE+++++UP+++MTU+++MAC
eth0+(eth0)++10.10.252.92/32++++++++++++++ethernet+up+++65535+00:00:00:00:00:00
++++:
DEV++WINDEVICE
eth0+<none>|8cljp|相关route+print|5630r|C:\Windows\system32>route+print
===========================================================================
Interface+list
8...........................Wintun+Userspace+Tunnel+#77
++:
IPv4+Route+table
===========================================================================
Active+routes:
Network+Destination+++++++Net+mask+++Gateway+++Interface+++++++Metric
192.168.20.0+++++++++255.255.255.0+++On-link+++10.10.252.92++++++5
192.168.20.255+++++255.255.255.255+++On-link+++10.10.252.92++++261|44ggp|使用--unprivileged选项解决了这个问题：|ae0vj|C:\Windows\system32>nmap+--unprivileged+-n+-P0+-p+22+192.168.20.1
Host+discovery+disabled+(-Pn).+All+addresses+will+be+marked+'up'+and+scan+times+will+be+slower.
Starting+Nmap+7.91+(+https://nmap.org+)+at+2021-06-08+13:22+Hora+de+verano+central+(MÚxico)
Nmap+scan+report+for+192.168.20.1
Host+is+up+(0.20s+latency).

PORT+++STATE+SERVICE
22/tcp+open++ssh

Nmap+done:+1+IP+address+(1+host+up)+scanned+in+0.29+seconds|atqbs^0|0|0|0|5|D|S|4|0|0|2|B|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|10|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|11|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|12|9|@]|A|@]|B|$H|I]]|$2|J|4|K|6|7|8|13|9|@$L|14|M|15|N|O]|$L|16|M|17|N|O]]|A|@]|B|$]]|$2|P|4|Q|6|G|8|18|9|@]|A|@]|B|$H|I]]|$2|R|4|S|6|7|8|19|9|@$L|1A|M|1B|N|O]]|A|@]|B|$]]|$2|T|4|U|6|G|8|1C|9|@]|A|@]|B|$H|I]]|$2|V|4|W|6|7|8|1D|9|@]|A|@]|B|$]]|$2|X|4|Y|6|G|8|1E|9|@]|A|@]|B|$H|I]]|$2|Z|4|-4|6|7|8|1F|9|@]|A|@]|B|$]]]]

TLDR: Use --unprivileged nmap option.
I just suffered the same problem when tried to scan/test hosts thru a Wireguard 0.3.14 tunnel in Windows 8.1 and Windows 7 using the last available versions, nmap 7.91, npcap 1.31. Tried several solutions/combinations, running as admin, reinstalling, etc., except downgrading to Winpcap 4.1.3 (the last available) with the same result:
<pre><code>C:\Windows\system32&gt;nmap -n -P0 -p 22 192.168.20.1
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-06-08 13:28 Hora de verano central (México)
dnet: Failed to open device eth0
QUITTING!
</code></pre>
It's strange that the interface listing of <code>nmap --iflist</code> does not show a device name associated with <code>eth0</code> (also doesn't show a MAC address, maybe it's Wireguard interface driver install/hooks at fault here). Relevant lines:
<pre><code>C:\Windows\system32&gt;nmap --iflist
Starting Nmap 7.91 ( https://nmap.org ) at 2021-06-08 13:32 Hora de verano central (México)
************************INTERFACES************************
DEV (SHORT) IP/MASK TYPE UP MTU MAC
eth0 (eth0) 10.10.252.92/32 ethernet up 65535 00:00:00:00:00:00
 :
DEV WINDEVICE
eth0 &lt;none&gt;
</code></pre>
Relevant <code>route print</code>:
<pre><code>C:\Windows\system32&gt;route print
===========================================================================
Interface list
8...........................Wintun Userspace Tunnel #77
 :
IPv4 Route table
===========================================================================
Active routes:
Network Destination Net mask Gateway Interface Metric
192.168.20.0 255.255.255.0 On-link 10.10.252.92 5
192.168.20.255 255.255.255.255 On-link 10.10.252.92 261
</code></pre>
Solved it using the --unprivileged option:
<pre><code>C:\Windows\system32&gt;nmap --unprivileged -n -P0 -p 22 192.168.20.1
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-06-08 13:22 Hora de verano central (MÚxico)
Nmap scan report for 192.168.20.1
Host is up (0.20s latency).

PORT STATE SERVICE
22/tcp open ssh

Nmap done: 1 IP address (1 host up) scanned in 0.29 seconds
</code></pre>

Error after starting command &gt; nmap
<pre><code>dnet: Failed to open device eth0 after installing NMAP.
QUITTING!
</code></pre>

After installing NMAP: dnet: Failed to open device eth0?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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 启动命令> nmap后出错 dnet: Failed to open device eth0 after installing NMAP.QUITTING! 

问安装NMAP后: dnet:无法打开device eth0？
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