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Access between LANs

Discussion in 'General Smart Home Discussion' started by Hans Pettersson, Mar 3, 2020.

  1. Hans Pettersson

    Hans Pettersson New Around Here

    Joined:
    Mar 3, 2020
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    Hi

    My home network looks lake this

    First router connected to Internet 100 Mbs fiber

    Connected to this router is a second router to witch some devices are connected
    devices like cameras remote switches ant switch.

    The second router has its own local network and all its clients are listening to port 80

    There is a port forwarded on the first router to the second

    1. Can a device/client on the second router/network be accessed from the first router/network (internet)
    knowing the devices IP, on the second network without forwarding any port on that network.

    2. Can a device/client on the second router/network access a device on the first router/network
    knowing that devices IP on the first network.

    /HansP
     
  2. ColinTaylor

    ColinTaylor Part of the Furniture

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    This statemnet makes me think that your second router is performing NAT on its WAN interface. Assuming that is the case...

    No.

    Yes.
     
  3. Hans Pettersson

    Hans Pettersson New Around Here

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    2. Can a device/client on the second router/network access a device on the first router/network
    knowing that devices IP on the first network.
    Yes.


    How?

    /HansP
     
  4. ColinTaylor

    ColinTaylor Part of the Furniture

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    It just works - This is assuming that there isn't a firewall on the target device that would block traffic from a non-local source. Try it.

    Think about it like this: as far as the second router is concerned everything upstream of its WAN port is "the internet". It doesn't matter whether the destination is on the "real" internet or the primary router's LAN. It's all the same as far as the second router is concerned.
     
  5. CaptainSTX

    CaptainSTX Part of the Furniture

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    Because devices on your second router can access devices on your first router it would be more secure to reverse the order of your routers and have your IoT devices connecting to this router then if/when they are compromised they will not be able to access your primary and hopefully more secure LAN and its connected devices.
     
    L&LD likes this.
  6. Hans Pettersson

    Hans Pettersson New Around Here

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    Thank you for the responce
    HansP