this post was submitted on 07 Apr 2025
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47
Basic networking/subnetting question. (lemmy.dbzer0.com)
submitted 3 weeks ago by marauding_gibberish142@lemmy.dbzer0.com to c/selfhosted@lemmy.world
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Sorry for being such a noob. My networking is not very strong, thought I'd ask the fine folks here.

Let's say I have a Linux box working as a router and a dumb switch (I.e. L2 only). I have 2 PCs that I would like to keep separated and not let them talk to each other.

Can I plug these two PCs into the switch, configure their interfaces with IPs from different subnets, and configure the relevant sub-interfaces and ACLs (to prevent inter-subnet communication through the router) on the Linux router?

What I'm asking is; do I really need VLANs? I do need to segregate networks but I do not trust the operating systems running on these switches which can do L3 routing.

If you have a better solution than what I described which can scale with the number of computers, please let me know. Unfortunately, networking below L3 is still fuzzy in my head.

Thanks!

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[–] marauding_gibberish142@lemmy.dbzer0.com 3 points 3 weeks ago (9 children)

I'd either have to do it in the router (which would need a lot of PCIe network cards which can get expensive + difficult to accommodate enough physical PCIe lanes on consumer hardware) or run it on a switch running a proprietary OS that I can't control and don't know what it's doing underneath.

[–] kylian0087@lemmy.dbzer0.com 4 points 3 weeks ago* (last edited 3 weeks ago) (6 children)

Can you elaborate why you think you need much more PCIe network cards? Technically you can do with 1 single LAN port with all your VLANs.

You configure the VLANs on the router then make a single trunk port to a switch. then have that switch divide the VLANs on the ports you desire. this can be a L2 switch.

[–] marauding_gibberish142@lemmy.dbzer0.com 2 points 3 weeks ago* (last edited 3 weeks ago) (4 children)

Thanks, but to make that work I would need a managed switch running a proprietary OS can I cannot trust. If there was a switch running a FOSS OS then I would use that

[–] kylian0087@lemmy.dbzer0.com 1 points 3 weeks ago (1 children)

Or a openwrt to make it L3

[–] marauding_gibberish142@lemmy.dbzer0.com 2 points 3 weeks ago

True, a commodity all-in-one-box running OpenWRT, or an SBC that supports it would work perfectly, except maybe for a lack of ports

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