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Why can't Wireshark see packets on Ethernet adapter?

asked 2018-10-04 08:38:39 +0000

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I have Windows 10.

I have three network adapters listed:

  1. Ethernet
  2. Ethernet 2
  3. Wifi

I disable the wifi and the ethernet 2 adapters and enable 'ethernet' and Wireshark sees it as a working adapter I think, because it shows it on the list of available adapters and it shows a wavy line on it, too - doesn't that mean it has detected traffic?

So I ask it to capture packets. It neither sees nor captures any.

Works fine with the wifi when I enable it.

But sees nothing on the ethernet adapters.

What's wrong?

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What capture engine do you have installed? WinPcap ro the newer NPcap? Also Firewall and other types of network related software installed may cause issues.

Jaap gravatar imageJaap ( 2018-10-04 09:19:31 +0000 )edit

ncap I think. I only installed wireshark a couple of hours ago and I let it do what it suggested - and I think it was ncap.

And I think my problem has gone away, maybe. I might have just been too hasty. I kept trying, Alternately disabling this adapter and enabling the other, then swap and so on. On the last attempt I suddenly saw an ARP.

I have been trying to find the IP of a camera and with no other adapter available and no gateway, no dns servers, the computer completely cut off, I expected some traffic from the computer and I hoped for traffic from the camera. Over that adapter.

Perhaps I didn't wait long enough. I only looked at the blank screen for a minute or two, at a guess, that'd seem like an eternity when you're looking for packets, wouldn't it ...(more)

abrogard gravatar imageabrogard ( 2018-10-04 09:37:52 +0000 )edit

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answered 2018-10-05 05:05:10 +0000

abrogard gravatar image

It looks like the answer is that it can't see packets if there are none.

I posed the question because I got blank output screens.

Then later when I just left it as it was packets began to appear. The (dahua) IP cam I was looking for was broadcasting.

So looks to me like wireshark was working alright and the adapter was working alright - but apparently sometimes there's just no traffic....

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Asked: 2018-10-04 08:38:39 +0000

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Last updated: Oct 05 '18