I would like your help to understand if installing a second NIC means another collision domain, or if it acts like another port in a hub (inside my PC).

  • It will not act like a hub... each NIC will have a different IP address and will not communicate one to another inside the PC without some special routing taking place. They will be on the same broadcast domain (collision domains are kind of a thing of the past) if you connect them to the same network, but two distinct interfaces. What are trying to accomplish? Without something special this will not bridge networks, increase your speed or performance, or provide resiliency.
    – acejavelin
    Apr 23 '16 at 18:05
  • Thank you for your help. So, do they act out like two VLANs? At work, we have two separated systems with the same subnet ( I want to avoid IP conflicts when I access repeated IPs on my browser. It is not possible to change IPs un one of the two networks because th ey are in 24/7 producción.
    – Jorge_S7
    Apr 23 '16 at 19:06
  • Every networking adapter is used to manage a video processor, which has a bulit-in web server to control their parameters
    – Jorge_S7
    Apr 23 '16 at 19:09
  • I am still not understanding... VLAN's are a different thing, they allow multiple subnets to exist in the same physical LAN topology with separation. I still don't understand why you have two NICs if they connected to the same subnet, all you are going to do is slow things down because Windows will get confused with the same subnet on two network adapters. Is this in a corporate environment? If so, this is off topic and you should contact your corporate IT staff, the possible implications in corporate environment are too complex to deal with in this situation.
    – acejavelin
    Apr 23 '16 at 20:02
  • Hi Acejavelin! Sorry for not being clear.
    – Jorge_S7
    Apr 23 '16 at 21:27

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