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veroxii ,

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.

Moonrise2473 OP ,

i had the idea that two gateways could work in the same network without issues… in my inexperience i tried it with three hosts on an hyperv virtual network and it worked.

my stupid idea it’s like this:

  • main router 192.168.1.1
  • opnsense LAN connected to a switch on router LAN1 192.168.1.254
  • opnsense WAN 192.168.1.2 (still on the switch on the router LAN2)
  • pc1 static IP address 192.168.1.3 with main router as gateway and this works
  • PC2 DHCP assigned by opnsense in a pool from 192.168.1.50 to 192.168.1.100 with opnsense 192.168.1.254 as gateway

why i do this? To have a “temporary” setup where i slowly move all the static ip addresses to opnsense and in this way everything can have a valid configuration

veroxii ,

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: 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.

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