I’ve been reconfiguring a router I built at the end of last year to be a transparent firewall (or filtering bridge) using Opnsense. On the router, I’ve got a Dell-branded Intel X520-DA2 NIC, along with some Flypro 10GBase-T SFP+ modules which I picked up on offer last year. But … they don’t work. Intel — like a lot of other vendors — restricts the SFP+ modules to those which have been approved, regardless of whether they may pose a problem and so you can’t just use any SFP+ mod...
