I change the IP address to in IPv4 for the ethernet adapter. However, after I disconnect the device, it still replies from when I ping How can it reply without the connection?enter image description here

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    If I get you right, you're pinging the device at your end of the unplugged cable. Why shouldn't it respond? – Kamil Maciorowski Jan 29 '19 at 22:16
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    I bet the ping time is really fast, too. – K7AAY Jan 29 '19 at 22:18

It looks like you are pinging your own IP address. You can think of it this way:

The ping gets to your network adapter, and the network adapter looks at it and says "Hey! That's me. I don't need to send this down the wire to anyone else. I can answer the ping myself".

So, it doesn't matter if your network cable is unplugged -- the ping still receives a response.

  • so is there a way to find out the IP address of the device? – Warden Huang Jan 30 '19 at 2:55
  • @WardenHuang, If by "device", you mean the Windows machine that the screenshots are from, its IP address is – Doug Deden Jan 30 '19 at 15:32

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