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Comment on Setting Up OPNsense on Proxmox: Doubts regarding NIC setup

xavier666@lemmy.umucat.day ⁨2⁩ ⁨days⁩ ago

Are you hosting more VMs on Proxmox that need network via a virtual switch?

Only one more VM which will host some services (to be accessed via a reverse proxy)

Are you providing network to other physical devices as well via a switch, so you need to output to that?

The Proxmox is connected to a switch, and all my other devices (other servers/PC/access point) are connected to this switch. Ideally, these services will connect to the OPNsense VM and get IP via DHCP from OPNsense.

Do you want OPNsense to be your gateway and assign IPs, or do you have a router?

OPNsense should be my public facing gateway, similar to what my current router (TP-Link) is doing. Currently, my router is connected to an ISP GPON. But it seems the GPON acts only as a fiber to ethernet converter. I use my ISP provided credentials on my ROUTER to authenticate with my ISP (via PPPoE)

As you have 3 NICs and sound like you want to use them, let’s assume you aren’t doing RoaS, but this could all be done on one (very busy) NIC.

RoaS? Router as a Service? I have no idea. I want to the 3rd port, but if you feel like this is a bit complicated, I can leave it for now, provided I don’t incur a heavy penalty for using the LAN port for traffic and Proxmox management.

And … you can do this!

Thank you, I needed that! I am just starting out with Proxmox and OPNsense and it seems a bit overwhelming. I am trying to start out small. In case everything blows up, I still have my old TP-Link router.

PS: Please check the original post as I have added a diagram regarding what I want to do.

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zarathustrad@lemmy.world ⁨1⁩ ⁨day⁩ ago
I essentially just did this as a total beginner and it worked. (I have built my own gaming PCs and took basic/Pascal programming in HS, but have no real network experience)

I had some old enterprise mini PCs, added a second NIC to one and put Opnscence and pihole VMs on it. I ended up doing PCI Passthrough for the new NIC for the Opnscence VM so the WAN/modem is isolated from the host. Bit a simple bridge works. The management LAN NIC is just in bridge mode.

I’m probably too new to be offering advice, so I’ll just pile on the encouragement. You can do it!

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dbtng@eviltoast.org ⁨2⁩ ⁨days⁩ ago
Cool. Yes, this looks reasonable. It looks logical.

So, my main recommendation is consider the use of virtual bridges to manage the network instead of passthrough. And I recommend installing and using the OVS style virtual bridge.
pve.proxmox.com/wiki/Open_vSwitch

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This gives you flexibility going forward. Say you want to run something out in the DMZ instead of behind the firewall, well you just attach that VM to the DMZ bridge instead. And it gives you an easy way to provision network for VMs. You just attach them to the LAN bridge.

(RoaS is a terrible name. Router on a Stick. It means your router is on the same switch as its clients, and all the communications go up and down that one port. It’s a perfectly legit way to manage a network, but sorta ugly and not what you are doing with your fancy 3-port rig. :)

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