this post was submitted on 07 Nov 2024
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Horsepower required for 10 Gbit router? (lemmy.world)
submitted 1 week ago by kalleboo@lemmy.world to c/selfhosted@lemmy.world
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My internet connection is getting upgraded to 10 Gbit next week. I’m going to start out with the rental router from the ISP, but my goal is to replace it with a home-built router since I host a bunch of stuff and want to separate my out home Wi-Fi, etc onto VLANs. I’m currently using the good old Ubiquiti USG4. I don’t need anything fancy like high-speed VPN tunnels (just enough to run SSH though), just routing IPv6 and IPv4 tunneling (MAP-E with a static IP) as the new connection is IPv6 native.

After doing a bit of research the Lenovo ThinkCenter M720q has caught my eye. There are tons of them available locally and people online seem to have good luck using them for router duties.

The one thing I have not figured out is what CPU option I should go for? There’s the Celeron G4900T (2 core), Core i3 8100T (4 core), and Core i5 (6 core). The former two are pretty close in price but the latter costs twice as much as anything else.

Doing research I get really conflicting results, with half of people saying that just routing IP even 10 Gbit is a piece of cake for any decently modern CPU and others saying they experienced bottlenecks.

I’ve also seen comments mentioning that the BSD-based routing platforms like pfSense are worse for performance than Linux-based ones like OpenWRT due to the lack of multi-threading in the former, I don’t know if this is true.

Does anyone here have any experience routing 10 Gbit on commodity hardware and can share their experiences?

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[–] eleitl@lemm.ee 1 points 4 days ago* (last edited 4 days ago)

Wire speed L2 in hardware is cheap, but layer 3 is not (and is typically limited to few k routes for campus type of switches). I have a Quanta LB 10G and a Brocade ICX 1G/10G/40G switches for lab use, which are hot and screamy but were cheap used. I would not trust software L3 implementations to not drop packets at high rates.