Are you running WAN and LAN on the same subnet connected to the same gateway?? That’s going to cause all kinds of weird issues. You can change LAN to a unique subnet instead.
i5-6500T can handle way more than gigabit throughput.
You can still do the setup nearly the same, but you’ll need to change the opnsense LAN to its own unique subnet, and put PC2 on that subnet with a manual IP setup.
Make sure you don’t enable DHCP on opnsense too, since that will really interfere with the existing router.
The only real downside to this, is PC2 traffic to access PC1 or other devices on the main router, will have to go through opnsense and you’ll need firewall rules for that.
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.
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
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.
Just add HideDesktopPreviewBanner=true to the [General] section in the ~/.config/kdeglobals file and restart plasmashell with systemctl restart --user plasma-plasmashell.service or just log out and back in.
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