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choosing a NIC for OPNsense (sh.itjust.works)

submitted 2 months ago by muusemuuse@sh.itjust.works to c/selfhosted@lemmy.world

28 comments fedilink hide all child comments

I'm planning out a proxmox box with an OPNsense VM for an upcoming build. I want to consolidate multiple little boxes into one more capable device.

I was planning on using a dual port NIC that I would passthru to the OPNsense VM. I like the idea of the WAN interface being piped directly to the VM rather than passing through the host and being presented as a virtual device. But that means BSD has to play nice with it and as I understand it, BSD network drivers can be temperamental and intel's drivers are just better.

I was looking at using a cheap dual port intel 226v NIC for this, but intel's not in a great place right now so I'd like to consider other options. Everywhere online, people scream "only use intel NICs for this" but I find it ridiculous that in 2025, nobody else has managed to make stable drivers for their hardware in this use case.

What are your experiences with non-intel NICs in OPNsense?

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[–] Cyber@feddit.uk 1 points 1 month ago (1 children)

Why the MTU change?

[–] lightnegative@lemmy.world 2 points 1 month ago (1 children)

Proxmox requires subtracting 50 from the MTU so it can store it's vxlan information in the packet.

From the docs:

Because VXLAN encapsulation uses 50 bytes, the MTU needs to be 50 bytes lower than the outgoing physical interface.

It's super annoying but I couldn't see another way of having vms be able to talk to each other transparently regardless of which node they are on

[–] Cyber@feddit.uk 1 points 1 month ago

Ah, ok, good to know, thanks