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With Wireshark 3.2 on Windows with Npcap, the only interface is the loopback interface

asked 2020-01-25 19:43:13 +0000

updated 2020-01-26 01:28:26 +0000

Guy Harris gravatar image

The new version is pretty terrible. I can't do anything with it at all.

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This is Windows, right?

Guy Harris gravatar imageGuy Harris ( 2020-01-25 20:04:04 +0000 )edit

Yes it is.

ZacharyMarquis gravatar imageZacharyMarquis ( 2020-01-25 20:05:21 +0000 )edit

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answered 2020-01-25 20:03:56 +0000

grahamb gravatar image

You have probably run into an issue with npcap, the third party capture library that is now used by Wireshark.

Unfortunately some users have local issues with npcap failing to install correctly and not making the normal network adaptors available. There have been a number of other questions on this topic posted on this site with suggested answers, have you looked at any of them? The tl;dr suggestion is try re-installing npcap, if that doesn't fix things, head off to the npcap support site.

P.S. I'm guessing that you're using Windows, reporting your OS and the version of Wireshark used in your question makes life easier for those attempting to help.

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Ah. I apologize. I should have included those. Its for a class I'm taking and I was not familiar with WireShark very much.It is Windows 10. And I believe I did narrow it down to npcap. If I did not install it, Wireshark seems to run fine.

ZacharyMarquis gravatar imageZacharyMarquis ( 2020-01-25 20:06:51 +0000 )edit

How do I search the npcap more specifically? I can only find where it did not install correctly and nothing necessarily similar to my problem. Essentially when I let npcap install, the only "adapter" I can listen to is something called a loopback channel.

ZacharyMarquis gravatar imageZacharyMarquis ( 2020-01-25 20:12:25 +0000 )edit

In general, npcap provides ALL the network adaptors Wireshark uses. If you don't install npcap then you can't capture on network interfaces.

Examples of similar questions found by using the search box at the top with "loopback":

Some of these refer to older versions of npcap that did have some known issues when uninstalling and upgrading npcap.

grahamb gravatar imagegrahamb ( 2020-01-25 20:36:27 +0000 )edit

Thank you! I will try reinstalling and completing some of the steps listed there.

ZacharyMarquis gravatar imageZacharyMarquis ( 2020-01-25 21:10:07 +0000 )edit

I've tried some of the methods above, to include the Avast registry fix, but I still only have the loop back traffic option. I can't start the npcap either, even though I can tell it is stopped. I think I will just uninstall npcap and use WinCap instead. Unless there is another fix I can try.

ZacharyMarquis gravatar imageZacharyMarquis ( 2020-01-25 21:52:50 +0000 )edit

Last comment. After doing a little more research, I uninstalled npcap after WireShark was installed, and then performed a fresh install of the latest npcap version. Now WireShark works with wireless and ethernet connections again.

ZacharyMarquis gravatar imageZacharyMarquis ( 2020-01-25 22:20:19 +0000 )edit

I can't start the npcap either

What's reported if you try to start it from the command line ("net start npf" from a window running as Administrator)?

Guy Harris gravatar imageGuy Harris ( 2020-01-25 23:45:29 +0000 )edit

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Asked: 2020-01-25 19:43:13 +0000

Seen: 128 times

Last updated: Jan 26