this post was submitted on 26 Dec 2023
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It'll be hard to find one at that price. You may find something with a 2.5G NIC but whether or not it will actually route at line speed is highly unlikely.
Your best bet to keep prices low is to add a 2.5G NIC to an old PC. Even that may not work
Out of curiosity, why are you not sure if adding a 2.5G NIC would work? From my reading almost any PCI-E port should be able to handle line speed for a 2.5 gigabit connection except PCI-E 3 x1.
Many of the 2.5g optics don't comply with standards and may not work in some devices.
I've never done it so I can't say for certain.
I typically buy purpose built routers which advertise routing speed benchmarks
PCIe 3.0 x1 is plenty for 2.5G.