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Joined 1 year ago
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Cake day: August 16th, 2023

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  • You can still do this but as others have said you need to have 2 separate lans. Your old Lan can go to PC 1 from old router. Then opnsense wan goes to your existing Lan and importantly you are now creating a new Lan on the lan side of opnsense. Here you can connect the PC 2 to test with. Each PC should only be on 1 Lan and each Lan should have a separate subnet.

    See this post and the last comment even references a diagram to exactly what you want: https://forum.opnsense.org/index.php?topic=32774.0

    There are all kinds of routing protocols and algorithms at play which don’t like loops and multiple routers competing to control the same subnet.


  • Your diagram is weird. Isn’t the opnsense box supposed to replace the router. Or at least it should be between the existing router and you clients. Pc 1 go to opnsense Lan. And opnsense wan to the router and internet.

    You’re creating all kinds of loops which is generally a bad idea. Your data should flow in 1 direction like a tree.

    Unless there are a lot of details you’re not sharing.

    Also remember generally a router is not a switch. Plug all your PCs into a switch. Plug a wifi access point into the switch. And then have the switch go into the lan of your opnsense.

    And then have the wan go out to the internet.