I'm connected with WiFi and the internet is running well, soon I connect the LAN wire which is connected to a NAS I lose the internet. WIFI get the IP over DHCP from Router, 192.168.2.xxx My wire connection I set to the NAS have I can see all files on the NAS but the internet is no more working. If I disconnect the wire the internet is back to normal.

What do I wrong

  • Give us output from command 'route -n' when you are connwcted only to wifi, and again when you are connected to both connection. Problem cause changes of default gateway when you connect cable. – 2707974 Jul 16 '17 at 10:42
  • Please add also output of cat /etc/network/interfaces and ifconfig – derHugo Jul 16 '17 at 12:51
  • Sorry about my poor explanation. I add EDIT 1 in my answer. – 2707974 Jul 17 '17 at 11:56

The problem occurs because both your interfaces are on the same subnet

 enp3s0    -> addr:
 wlp2s0    -> addr:

In network topology

--------      wifi        ----------  
|      |------------------| router |
|  PC  |                  ----------
|      |----------| lan   --------
--------          |-------|  NAS |

The solution will be to change the subnet on one link, wifi or lan.

If you do not use lan link except to access NAS, on lan card, do not use gateway setting. It's enough to set up IP and network mask.

When I say to change subnet I meat to change networks, not only subnet mask.

Example of setup



In this setup you must change ip address on router lan port to192.168.3.1

  • Hi i try this and change the subnet to but no different. – Marcel Jul 17 '17 at 5:01

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