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    That adds a burden to your PC's CPU you may not like. What you describe is 'routing', and PC hardware is not optimized to route data through different interfaces. You can do it, yes, but it will shift a computing burden from your existing router (which is optimized for that job) to your PC (which is not). Do you want to slow down your PC to do that routing job? If so, start reading linux.com/news/linux-lan-routing-beginners-part-1 linux.com/tutorials/linux-lan-routing-beginners-part-2 et askubuntu.com/a/452755/197910
    – K7AAY
    Commented Nov 1, 2019 at 17:26
  • Ok, thank you very much, this is a very interesting link. But actually, I don't need to route I think because I just want to have an Ethernet link to a local network, and the wifi for internet. Those networks are so separates. Is it possible?
    – pierre
    Commented Nov 7, 2019 at 15:08
  • Yes, you can! (As The Man would say.) However, your OS will need to route all the local traffic to your Ethernet port and all the other traffic to your WiFi port, so you will need to configure that. Is the WiFi router connecting you to the Internet different from the switch which connects your Ethernet port to the IP webcam, or are they the same? What's the IP address for the WiFi Wireless Access port, your default gateway, & the IP webcam? Please click edit and add that info to your original question. Please do not use Add comment; instead, please put it in the question w/ edit.
    – K7AAY
    Commented Nov 7, 2019 at 16:45