8000 Document that Npcap must be installed in WinPCap compatible mode by dedemorton · Pull Request #5849 · elastic/beats · GitHub
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Document that Npcap must be installed in WinPCap compatible mode #5849

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Dec 15, 2017
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Document that Npcap must be installed in WinPCap compatible mode #5849

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10 changes: 6 additions & 4 deletions packetbeat/docs/faq.asciidoc
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Expand Up @@ -31,10 +31,12 @@ Packetbeat is unable to capture traffic from the loopback device (127.0.0.1 traf
because the Windows TCP/IP stack does not implement a network loopback interface,
making it difficult for Windows packet capture drivers like WinPcap to sniff traffic.

As a workaround, you can try installing https://github.com/nmap/npcap/releases[Npcap],
an update of WinPcap. Make sure that you restart Windows after installing Npcap.
Npcap creates an Npcap Loopback Adapter that you can select if you want to capture
loopback traffic.
As a workaround, you can try installing
https://github.com/nmap/npcap/releases[Npcap], an update of WinPcap. Make sure
you install Npcap in WinPcap API-compatible mode (`/winpcap_mode=yes`), or
{beatname_uc} will be unable to find the required DLLs. After installing Npcap,
restart Windows. Npcap creates an Npcap Loopback Adapter that you can select if
you want to capture loopback traffic.

For the list of devices shown here, you would configure Packetbeat
to use device `4`:
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