Can a PC on a router see data sent to a second PC on the same router?

I have a Motorola router. It has two ethernet cables coming out of it, to two different PCs. Can either PC .. "see" data going to the other one?

Update:

Each PC is receiving data from the internet / an MS-Outlook server. The PCs are NOT connected directly. But they are each receiving data through the router, for queries made on the internet.

9 Answers

Relevance
  • BigE
    Lv 7
    5 years ago

    If it is a switch (which most routers are) you can only see broadcast data. If the router/switch is a managed one (not a home one) then an admin can mirror the port (inspect packets) but all home routers are not managed.

    A home user can rewire a sniffer tap or hub and that would allow it to be packet captured but that would require rewiring it.

    So no, because it is a switch packets cannot be captured. The more likely access is actually doing some attack PC to PC because you are in the same network.

  • 5 years ago

    Not with a home router connected by Ethernet. The switch in the router will only transfer data to the designated target. For example, between a computer and the Internet or between two computers connected to the router. For Ethernet connections to a home router, spying on the communications of another computer connected to the router is not possible.

    For WiFi connections, the situation is different. WiFi is equivalent to using a hub, and all wireless computers can potentially spy on the communications for other computers on the same WiFi network.

    I hope this helps.

  • 5 years ago

    The router will echo all traffic with a local destination to all ports simultaneously. This behavior is by design. So yes, this means that all computers connected to any of the LAN ports of your router will 'see' the traffic destined to other PCs. If you want to see this traffic, install a network analyzer like Wireshark.

  • GTB
    Lv 7
    5 years ago

    If the PC is authorized to monitor the router or if you have certain LAN software

  • What do you think of the answers? You can sign in to give your opinion on the answer.
  • 5 years ago

    The data passes through so yeah

    I'd like to add I'm not a fan of motorola nowadays

  • Anonymous
    5 years ago

    Yes, if. **If** one of the PCs is running some network sniffing software and its being used by an experienced network admin.

    Otherwise, No.

  • Thato
    Lv 5
    5 years ago

    Yes, they can see the data that they are sending to each other.

  • 5 years ago

    Yes they can you need to use wireshark

Still have questions? Get answers by asking now.